Index: firmware/App/Modes/ModeSolo.c
===================================================================
diff -u -rcc398b14ccf518f350b57fb5cb8728e5c908bd1e -r7d4711edd7b40cd3e29f43e766f79a8a09586fe9
--- firmware/App/Modes/ModeSolo.c	(.../ModeSolo.c)	(revision cc398b14ccf518f350b57fb5cb8728e5c908bd1e)
+++ firmware/App/Modes/ModeSolo.c	(.../ModeSolo.c)	(revision 7d4711edd7b40cd3e29f43e766f79a8a09586fe9)
@@ -1,17 +1,17 @@
 /**************************************************************************
 *
-* Copyright (c) 2019-2020 Diality Inc. - All Rights Reserved.
+* Copyright (c) 2020-2024 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 ModeSolo.c
+* @file    ModeSolo.c
 *
-* @author (last) Sean Nash
-* @date (last) 20-Jul-2020
+* @author  (last)      Michael Garthwaite
+* @date    (last)      16-May-2023
 *
-* @author (original) Sean
-* @date (original) 18-Mar-2020
+* @author  (original)  Sean
+* @date    (original)  18-Mar-2020
 *
 ***************************************************************************/
 
@@ -38,9 +38,8 @@
 /*********************************************************************//**
  * @brief
  * The initSoloMode function initializes the solo standby mode module.
- * @details
- * Inputs : none
- * Outputs : Solo standby mode module initialized
+ * @details Inputs: none
+ * @details Outputs: Solo standby mode module initialized
  * @return none
  *************************************************************************/
 void initSoloMode( void )
@@ -51,22 +50,24 @@
 /*********************************************************************//**
  * @brief
  * The transitionToSoloMode function prepares for transition to solo standby mode.
- * @details
- * Inputs : none
- * Outputs : Re-initialized solo standby mode
- * @return none
+ * @details Inputs: none
+ * @details Outputs: Re-initialized solo standby mode
+ * @return initial state
  *************************************************************************/
-void transitionToSoloMode( void )
+U32 transitionToSoloMode( void )
 {
     initSoloMode();
+    setCurrentSubState( NO_SUB_STATE );
+    setCPLDCleanLEDColor( CPLD_CLEAN_LED_OFF );
+
+    return soloState;
 }
 
 /*********************************************************************//**
  * @brief
  * The execSoloMode function executes the solo standby mode state machine.
- * @details
- * Inputs : none
- * Outputs : Solo standby mode state machine executed
+ * @details Inputs: none
+ * @details Outputs: Solo standby mode state machine executed
  * @return current state.
  *************************************************************************/
 U32 execSoloMode( void )
@@ -83,7 +84,7 @@
             break;
 
         default:
-            // TODO - s/w fault
+            SET_ALARM_WITH_2_U32_DATA( ALARM_ID_DG_SOFTWARE_FAULT, SW_FAULT_ID_SOLO_MODE_INVALID_EXEC_STATE, soloState )
             soloState = DG_SOLO_STANDBY_STATE_START;
             break;
     }
@@ -94,9 +95,8 @@
 /*********************************************************************//**
  * @brief
  * The handleIdleDGSoloStandbyState function handles the idle state of solo standby mode.
- * @details
- * Inputs : none
- * Outputs : none
+ * @details Inputs: none
+ * @details Outputs: none
  * @return the next state of solo standby mode.
  *************************************************************************/
 static DG_SOLO_STANDBY_STATE_T handleIdleDGSoloStandbyState( void )
@@ -115,9 +115,8 @@
 /*********************************************************************//**
  * @brief
  * The getCurrentSoloState function returns the current state of solo standby mode.
- * @details
- * Inputs : soloState
- * Outputs : none
+ * @details Inputs: soloState
+ * @details Outputs: none
  * @return the current state of solo standby mode.
  *************************************************************************/
 DG_SOLO_STANDBY_STATE_T getCurrentSoloState( void )