Index: MsgDefs.h
===================================================================
diff -u -rb2c9020a216950ff7cb28510b64a1ae8b1a36df5 -r964a33bd9ba9a6257c6d0f2017586d82ef72b242
--- MsgDefs.h	(.../MsgDefs.h)	(revision b2c9020a216950ff7cb28510b64a1ae8b1a36df5)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision 964a33bd9ba9a6257c6d0f2017586d82ef72b242)
@@ -205,6 +205,8 @@
     MSG_ID_UI_INSTALLATION_CONFIRM_RESPONSE = 0xAD,                     ///< HD Confirm installation response
     MSG_ID_DG_FILL_MODE_DATA = 0xAE,                                    ///< DG broadcast of fill mode data such as used acid & bicarb volume
     MSG_ID_DG_BAD_FILL_SUB_STATE = 0xAF,                                ///< DG broadcast of idle mode bad fill sub-state
+    MSG_ID_UI_REQUEST_SERVICE_MODE = 0xB0,                              ///< UI request to HD to go to service mode
+    MSG_ID_HD_RESPONSE_SERVICE_MODE_REQUEST = 0xB1,                     ///< HD response to UI request to go to service mode
 
 #ifdef EMC_TEST_BUILD
     MSG_ID_CAN_ERROR_COUNT = 0x999,  // test code in support of EMC testing
@@ -479,7 +481,7 @@
     REQUEST_REJECT_REASON_DG_NOT_IN_STANDBY_IDLE_STATE = 34,            ///< Treatment cannot initiate if DG is not in standby idle state
     REQUEST_REJECT_REASON_INVALID_REQUEST_FORMAT = 35,                  ///< Request message not formatted properly
     REQUEST_REJECT_REASON_INVALID_DATE_OR_TIME = 36,                    ///< Given date/time is invalid
-    REQUEST_REJECT_REASON____AVAILABLE_1 = 37,                          ///< Not used - available for use
+    REQUEST_REJECT_REASON_TREATMENT_IN_PROGRESS = 37,                   ///< Treatment is in progress
     REQUEST_REJECT_REASON_BATTERY_IS_NOT_CHARGED = 38,                  ///< Battery does not have enough charge to start treatment
     REQUEST_REJECT_REASON_RINSEBACK_NOT_COMPLETED = 39,                 ///< Cannot move on to recirculate without completing full rinseback.
     REQUEST_REJECT_REASON_RESERVOIR_ONE_IS_NOT_READY = 40,              ///< Reservoir one fill is not complete