Index: firmware/App/Modes/ModePostTreat.c
===================================================================
diff -u -r4add9605a250a0b953217c8673204b705128561b -r8b09199bae9870a8d63d4be9636ef66c849f8531
--- firmware/App/Modes/ModePostTreat.c	(.../ModePostTreat.c)	(revision 4add9605a250a0b953217c8673204b705128561b)
+++ firmware/App/Modes/ModePostTreat.c	(.../ModePostTreat.c)	(revision 8b09199bae9870a8d63d4be9636ef66c849f8531)
@@ -171,6 +171,7 @@
 U32 execPostTreatmentMode( void )
 {
     BOOL stop = isStopButtonPressed();
+    HD_POST_TREATMENT_STATE_T priorSubState = currentPostTreatmentState;
 
     switch ( currentPostTreatmentState )
     {
@@ -195,6 +196,11 @@
             break;
     }
 
+    if ( priorSubState != currentPostTreatmentState )
+    {
+        SEND_EVENT_WITH_2_U32_DATA( HD_EVENT_SUB_MODE_CHANGE, priorSubState, currentPostTreatmentState );
+    }
+
     if ( ++postTreatmentPublishTimerCounter >= getU32OverrideValue( &postTreatmentModePublishInterval ) )
     {
         POST_TREATMENT_STATE_DATA_T data;
@@ -512,6 +518,8 @@
  *************************************************************************/
 static void execDrainReservoirs( void )
 {
+    DRAIN_STATE_T priorSubState = currentDrainReservoirState;
+
     switch ( currentDrainReservoirState )
     {
         case DRAIN_DG_DEPRIME_STATE:
@@ -538,6 +546,11 @@
             SET_ALARM_WITH_2_U32_DATA( ALARM_ID_HD_SOFTWARE_FAULT, SW_FAULT_ID_POST_TREATMENT_RESERVOIR_MGMT_INVALID_STATE, currentDrainReservoirState );
             break;
     }
+
+    if ( priorSubState != currentDrainReservoirState )
+    {
+        SEND_EVENT_WITH_2_U32_DATA( HD_EVENT_SUB_STATE_CHANGE, priorSubState, currentDrainReservoirState );
+    }
 }
 
 /*********************************************************************//**