Index: firmware/App/Modes/ModeService.c
===================================================================
diff -u -r911f6526ec3ba03ba0131681c7fb371c0abda6bb -rcd5be724d5a3ba7457e761191d82f278654d7f5c
--- firmware/App/Modes/ModeService.c	(.../ModeService.c)	(revision 911f6526ec3ba03ba0131681c7fb371c0abda6bb)
+++ firmware/App/Modes/ModeService.c	(.../ModeService.c)	(revision cd5be724d5a3ba7457e761191d82f278654d7f5c)
@@ -1,22 +1,32 @@
 /**************************************************************************
 *
-* Copyright (c) 2019-2020 Diality Inc. - All Rights Reserved.
+* Copyright (c) 2019-2024 Diality Inc. - All Rights Reserved.
 *
 * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
 * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
 *
-* @file ModeService.c
+* @file    ModeService.c
 *
-* @author (last) Sean Nash
-* @date (last) 24-Sep-2020
+* @author  (last)      Dara Navaei
+* @date    (last)      17-Oct-2023
 *
-* @author (original) Dara Navaei
-* @date (original) 05-Nov-2019
+* @author  (original)  Dara Navaei
+* @date    (original)  05-Nov-2019
 *
 ***************************************************************************/
 
-#include "OperationModes.h"
+#include "AirPump.h"
+#include "BloodFlow.h"
+#include "Buttons.h"
+#include "DGInterface.h"
+#include "DialInFlow.h"
+#include "DialOutFlow.h"
 #include "ModeService.h"
+#include "NVDataMgmt.h"
+#include "OperationModes.h"
+#include "Switches.h"
+#include "SyringePump.h"
+#include "Valves.h"
 
 /**
  *  @addtogroup HDServiceMode
@@ -43,14 +53,36 @@
  * The transitionToServiceMode function prepares for transition to service mode.
  * @details Inputs: none
  * @details Outputs: none
- * @return none
+ * @return initial state
  *************************************************************************/
-void transitionToServiceMode( void )
+U32 transitionToServiceMode( void )
 {
+    initServiceMode();
+
+    doorClosedRequired( FALSE, FALSE );
+    syringeDetectionRequired( FALSE );
+    setCurrentSubState( NO_SUB_STATE );
+
     // Set user alarm recovery actions allowed in this mode
     setAlarmUserActionEnabled( ALARM_USER_ACTION_RESUME, FALSE );
     setAlarmUserActionEnabled( ALARM_USER_ACTION_RINSEBACK, FALSE );
     setAlarmUserActionEnabled( ALARM_USER_ACTION_END_TREATMENT, FALSE );
+
+    // Start out with all actuators off in service mode (exception for valves which will be in insert position to allow cartridge insert)
+    cmdStopDGTrimmerHeater();
+    stopSyringePump();
+    signalBloodPumpHardStop();
+    signalDialInPumpHardStop();
+    signalDialOutPumpHardStop();
+    setAirPumpState( AIR_PUMP_STATE_OFF );
+
+    setValveAirTrap( STATE_CLOSED );
+    setValvePosition( VDI, VALVE_POSITION_A_INSERT_EJECT );
+    setValvePosition( VDO, VALVE_POSITION_A_INSERT_EJECT );
+    setValvePosition( VBA, VALVE_POSITION_A_INSERT_EJECT );
+    setValvePosition( VBV, VALVE_POSITION_A_INSERT_EJECT );
+
+    return 0;
 }
 
 /*********************************************************************//**
@@ -62,6 +94,13 @@
  *************************************************************************/
 U32 execServiceMode( void )
 {
+    BOOL stop = isStopButtonPressed();
+
+    if ( TRUE == stop )
+    {
+        // Ignore stop button in this mode.
+    }
+
     return 0; // TODO - return current state
 }