Index: firmware/App/Modes/OperationModes.c
===================================================================
diff -u -rebbb1f85550a1f9b8f946655f7b2b63f76fbf67d -r1a5efe97f5f39594b45797fded52cafce92afe80
--- firmware/App/Modes/OperationModes.c	(.../OperationModes.c)	(revision ebbb1f85550a1f9b8f946655f7b2b63f76fbf67d)
+++ firmware/App/Modes/OperationModes.c	(.../OperationModes.c)	(revision 1a5efe97f5f39594b45797fded52cafce92afe80)
@@ -44,6 +44,7 @@
 // ********** private data **********
 
 static volatile BOOL modeRequest[ NUM_OF_DG_MODES - 1 ];                            ///< Array of mode request flags.
+static DG_OP_MODE_T lastMode = DG_MODE_INIT;                                        ///< Last operation mode prior to current mode.
 static DG_OP_MODE_T currentMode = DG_MODE_INIT;                                     ///< The currently active mode.
 static U32 currentSubMode = 0;                                                      ///< The currently active state of the active mode.
 static U32 broadcastModeIntervalCtr = 11;                                           ///< Interval counter used to determine when to broadcast operation mode.  Initialize to 11 to stagger broadcast.
@@ -56,7 +57,7 @@
         /* SERV     */{ DG_MODE_FAUL, DG_MODE_SERV, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG },
         /* INIT     */{ DG_MODE_FAUL, DG_MODE_NLEG, DG_MODE_INIT, DG_MODE_STAN, DG_MODE_SOLO, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG },
         /* STAN     */{ DG_MODE_FAUL, DG_MODE_SERV, DG_MODE_NLEG, DG_MODE_STAN, DG_MODE_SOLO, DG_MODE_CIRC, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_FLUS, DG_MODE_HEAT, DG_MODE_CHEM },
-        /* SOLO     */{ DG_MODE_FAUL, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_STAN, DG_MODE_SOLO, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_FLUS, DG_MODE_HEAT, DG_MODE_NLEG },
+        /* SOLO     */{ DG_MODE_FAUL, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_STAN, DG_MODE_SOLO, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_FLUS, DG_MODE_HEAT, DG_MODE_CHEM /*DG_MODE_NLEG*/ }, // TODO for testing only
         /* CIRC     */{ DG_MODE_FAUL, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_STAN, DG_MODE_NLEG, DG_MODE_CIRC, DG_MODE_FILL, DG_MODE_DRAI, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG },
         /* FILL     */{ DG_MODE_FAUL, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_STAN, DG_MODE_NLEG, DG_MODE_CIRC, DG_MODE_FILL, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG },
         /* DRAI     */{ DG_MODE_FAUL, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_STAN, DG_MODE_NLEG, DG_MODE_CIRC, DG_MODE_NLEG, DG_MODE_DRAI, DG_MODE_NLEG, DG_MODE_NLEG, DG_MODE_NLEG },
@@ -134,6 +135,7 @@
     if ( currentMode != newMode )
     {
         // handle transition to new mode
+        lastMode = currentMode;
         transitionToNewOperationMode( newMode );
         currentMode = newMode;
     }
@@ -232,6 +234,18 @@
 
 /*********************************************************************//**
  * @brief
+ * The getPreviousOperationMode function gets the previous operation mode.
+ * @details Inputs: lastMode
+ * @details Outputs: none
+ * @return the previous operation mode
+ *************************************************************************/
+DG_OP_MODE_T getPreviousOperationMode( void )
+{
+    return lastMode;
+}
+
+/*********************************************************************//**
+ * @brief
  * The arbitrateModeRequest function selects highest priority mode request
  * and clear all requests.
  * @details Inputs: none