Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -ra7821aff3dc204a060233b0753253ec04d020557 -rfcbf16998f91c7c14ac952badfef65f3e012f160
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision a7821aff3dc204a060233b0753253ec04d020557)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision fcbf16998f91c7c14ac952badfef65f3e012f160)
@@ -81,6 +81,7 @@
 
 #define PSI_TO_MMHG                         ( 51.7149F )                                    ///< Conversion factor for converting PSI to mmHg.
 
+// The new arterial pressure sensor is the same as the venous pressure sensor
 #define VENOUS_PRESSURE_NORMAL_OP           0                                               ///< Venous pressure status bits indicate normal operation.
 #define VENOUS_PRESSURE_CMD_MODE            1                                               ///< Venous pressure status bits indicate sensor in command mode.
 #define VENOUS_PRESSURE_STALE_DATA          2                                               ///< Venous pressure status bits indicate data is stale (no new data since last fpga read).
@@ -817,7 +818,6 @@
                 }
             }
         }
-
         // Check for occlusion in Treatment modes where pumps are moving
         else if ( MODE_TREA == getCurrentOperationMode() )
         {
Index: firmware/App/Controllers/SyringePump.c
===================================================================
diff -u -r2dd1b02e90c90fcd94bf9b21245282205a963654 -rfcbf16998f91c7c14ac952badfef65f3e012f160
--- firmware/App/Controllers/SyringePump.c	(.../SyringePump.c)	(revision 2dd1b02e90c90fcd94bf9b21245282205a963654)
+++ firmware/App/Controllers/SyringePump.c	(.../SyringePump.c)	(revision fcbf16998f91c7c14ac952badfef65f3e012f160)
@@ -162,10 +162,12 @@
 #define SYRINGE_PUMP_STALL_SPEED_THRESHOLD            0.05F                                 ///< Minimum syringe pump speed to be considered not stalled.
 
 #define SYRINGE_PUMP_ADC_FPGA_ERROR_TIMEOUT_MS        ( 2 * MS_PER_SECOND )                 ///< Syringe pump ADC FPGA error timeout in milliseconds.
+
 #define SYRINGE_PUMP_DAC_MAX_RETRIES                  5                                     ///< Syringe pump DAC retries to write.
 #define SYRINGE_PUMP_DAC_TIMER                        ( 200 / TASK_PRIORITY_INTERVAL )      ///< Syringe pump DAC timer between retries.
 #define SYRINGE_PUMP_OCCLUSION_PERSISTENCE            50                                    ///< Syringe pump occlusion persistence timer in milliseconds.
 #define SYRINGE_PUMP_EMPTY_FORCE_COUNT                5                                     ///< Syringe pump empty force voltage count persistence.
+
 /// Defined states for the syringe pump control state machine.
 typedef enum SyringePump_States
 {
@@ -339,6 +341,7 @@
     initPersistentAlarm( ALARM_ID_HD_SYRINGE_PUMP_CONTROLLER_DIRECTION_ERROR, 0, SYRINGE_PUMP_DIR_ALARM_PERSISTENCE );
     initPersistentAlarm( ALARM_ID_HD_SYRINGE_PUMP_RUNNING_WHILE_BP_OFF_ERROR, 0, SYRINGE_PUMP_OFF_ALARM_PERSISTENCE );
     initPersistentAlarm( ALARM_ID_HD_SYRINGE_PUMP_SPEED_ERROR, 0, SYRINGE_PUMP_RATE_ALARM_PERSISTENCE );
+    initPersistentAlarm( ALARM_ID_HD_SYRINGE_PUMP_OCCLUSION, 0, SYRINGE_PUMP_OCCLUSION_PERSISTENCE);
     initTimeWindowedCount( TIME_WINDOWED_COUNT_SYRINGE_PUMP_OFF_ERROR, SYRINGE_PUMP_OFF_ERROR_MAX_CNT, SYRINGE_PUMP_OFF_ERROR_TIME_WIN_MS );
 
     initFPGAPersistentAlarm( FPGA_PERS_ERROR_SYRINGE_PUMP_ADC, ALARM_ID_HD_SYRINGE_PUMP_FPGA_ADC_FAULT,
Index: firmware/App/Modes/ConsumableSelfTest.c
===================================================================
diff -u -r3970ba21aa2500f662620ef3d4b3e1e7a48fc47a -rfcbf16998f91c7c14ac952badfef65f3e012f160
--- firmware/App/Modes/ConsumableSelfTest.c	(.../ConsumableSelfTest.c)	(revision 3970ba21aa2500f662620ef3d4b3e1e7a48fc47a)
+++ firmware/App/Modes/ConsumableSelfTest.c	(.../ConsumableSelfTest.c)	(revision fcbf16998f91c7c14ac952badfef65f3e012f160)
@@ -110,6 +110,7 @@
             if ( TRUE == consumableInstallConfirmed )  // TODO - should we check that concentrate cap is off too?
             {
                 consumableInstallConfirmed = FALSE;
+
 #ifndef _RELEASE_
                 if ( SW_CONFIG_ENABLE_VALUE == getSoftwareConfigStatus( SW_CONFIG_DISABLE_CONSUMABLES_TESTS ) )
                 {
Index: firmware/App/Modes/ModeStandby.c
===================================================================
diff -u -ra7821aff3dc204a060233b0753253ec04d020557 -rfcbf16998f91c7c14ac952badfef65f3e012f160
--- firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision a7821aff3dc204a060233b0753253ec04d020557)
+++ firmware/App/Modes/ModeStandby.c	(.../ModeStandby.c)	(revision fcbf16998f91c7c14ac952badfef65f3e012f160)
@@ -71,6 +71,7 @@
 static OVERRIDE_U32_T standbyModePublishInterval = { DISINFECTS_DATA_PUB_INTERVAL, DISINFECTS_DATA_PUB_INTERVAL, DISINFECTS_DATA_PUB_INTERVAL, 0 };
 
 static const U32 SERVICE_TIME_INTERVAL_S = (U32)( 365 * 0.5 * SECONDS_IN_A_DAY );              ///< HD/DG 6-month service interval in seconds.
+static BOOL homingInitiated;                                                                   ///< Flag indicates actuator homing has been initiated from standby mode.
 
 // ********** private function prototypes **********
 
Index: firmware/App/Modes/ModeTreatmentParams.c
===================================================================
diff -u -r1f4d0aead50079c495871c7d0ea1c410186a90c2 -rfcbf16998f91c7c14ac952badfef65f3e012f160
--- firmware/App/Modes/ModeTreatmentParams.c	(.../ModeTreatmentParams.c)	(revision 1f4d0aead50079c495871c7d0ea1c410186a90c2)
+++ firmware/App/Modes/ModeTreatmentParams.c	(.../ModeTreatmentParams.c)	(revision fcbf16998f91c7c14ac952badfef65f3e012f160)
@@ -7,8 +7,8 @@
 *
 * @file    ModeTreatmentParams.c
 *
-* @author  (last)      Sean Nash
-* @date    (last)      31-May-2023
+* @author  (last)      Michael Garthwaite
+* @date    (last)      16-May-2023
 *
 * @author  (original)  Sean Nash
 * @date    (original)  29-May-2020
Index: firmware/App/Modes/OperationModes.c
===================================================================
diff -u -r33172fb03fd33afef26de13c343480c62cfa1a3c -rfcbf16998f91c7c14ac952badfef65f3e012f160
--- firmware/App/Modes/OperationModes.c	(.../OperationModes.c)	(revision 33172fb03fd33afef26de13c343480c62cfa1a3c)
+++ firmware/App/Modes/OperationModes.c	(.../OperationModes.c)	(revision fcbf16998f91c7c14ac952badfef65f3e012f160)
@@ -7,8 +7,8 @@
 *
 * @file    OperationModes.c
 *
-* @author  (last)      Sean Nash
-* @date    (last)      31-May-2023
+* @author  (last)      Michael Garthwaite
+* @date    (last)      16-May-2023
 *
 * @author  (original)  Dara Navaei
 * @date    (original)  05-Nov-2019
Index: firmware/App/Modes/OperationModes.h
===================================================================
diff -u -r60c102696e521ff82452aaad30e1db9f240eef58 -rfcbf16998f91c7c14ac952badfef65f3e012f160
--- firmware/App/Modes/OperationModes.h	(.../OperationModes.h)	(revision 60c102696e521ff82452aaad30e1db9f240eef58)
+++ firmware/App/Modes/OperationModes.h	(.../OperationModes.h)	(revision fcbf16998f91c7c14ac952badfef65f3e012f160)
@@ -53,6 +53,7 @@
 void setConfirmationRequestStatus( GENERIC_CONFIRM_ID_T requestID, CONFIRMATION_REQUEST_STATUS_T status );   // Set the confirmation request status
 GENERIC_CONFIRM_ID_T addConfirmationRequest( GENERIC_CONFIRM_ID_T requestID, GENERIC_CONFIRM_COMMAND_T requestType, U32 rejectReason );  // Add a new confirmation request
 void setCurrentSubState( U32 subState );                            // Set the current substate.
+void setCurrent4thLevelState( U32 state );                          // Set the current 4th level state.
 
 BOOL testSetOperationMode( HD_OP_MODE_T newMode );                  // Force transition to a given mode (if allowed)
 BOOL testSetOpModePublishIntervalOverride( U32 ms );