Index: firmware/App/Modes/Prime.c
===================================================================
diff -u -r0a4dcd288d4347b85baaa0b07da568b6add5eac7 -r82b7c4c94b0f8b3f8a3d3d2e41384a7a7d497215
--- firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 0a4dcd288d4347b85baaa0b07da568b6add5eac7)
+++ firmware/App/Modes/Prime.c	(.../Prime.c)	(revision 82b7c4c94b0f8b3f8a3d3d2e41384a7a7d497215)
@@ -218,6 +218,7 @@
  *************************************************************************/
 void execPrime( void )
 {
+    HD_PRE_TREATMENT_PRIME_STATE_T priorSubState = currentPrimeState;
     // execute prime sub-mode state machine
     switch ( currentPrimeState )
     {
@@ -293,6 +294,11 @@
     // Prime flags should be handled by now
     resetPrimeFlags();
 
+    if ( priorSubState != currentPrimeState )
+    {
+        SEND_EVENT_WITH_2_U32_DATA( HD_EVENT_SUB_STATE_CHANGE, priorSubState, currentPrimeState );
+    }
+
     // Broadcast priming data
     broadcastPrimingStatus();
 }