Index: firmware/App/Controllers/DGInterface.h
===================================================================
diff -u -r7499a42cc0f906f9a4a947c82c5b4615217ce7e5 -r481c81493ac2bf73d1d371cabee016ab8ad8d06c
--- firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision 7499a42cc0f906f9a4a947c82c5b4615217ce7e5)
+++ firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision 481c81493ac2bf73d1d371cabee016ab8ad8d06c)
@@ -181,6 +181,7 @@
 void cmdStartDGChemicalDisinfect( void );
 void cmdStopDGChemicalDisinfect( void );
 void cmdRequestDGMixingRatios( void );
+void cmdSetDGToServiceMode( void );
 
 void handleDGCommandResponse( DG_CMD_RESPONSE_T *dgCmdRespPtr );
 BOOL getDGCommandResponse( U32 commandID, DG_CMD_RESPONSE_T *cmdRespPtr );
Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -r1978e8476dc44688ed69531c236c154829ab8a76 -r481c81493ac2bf73d1d371cabee016ab8ad8d06c
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 1978e8476dc44688ed69531c236c154829ab8a76)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 481c81493ac2bf73d1d371cabee016ab8ad8d06c)
@@ -392,9 +392,15 @@
 // MSG_ID_DG_START_STOP_CHEM_DISINFECT
 BOOL sendDGStartChemicalDisinfectModeCommand( BOOL start );
 
+// MSG_ID_HD_RESPONSE_SERVICE_MODE_REQUEST
+void sendUIServiceModeResponse( BOOL accepted, U32 rejCode );
+
 // MSG_ID_HD_REQUEST_DG_SERVICE_MODE
-BOOL sendDGServiceModeRequest();
+BOOL sendDGServiceModeRequest( void );
 
+// MSG_ID_UI_REQUEST_SERVICE_MODE
+void handleUIServiceModeRequest( MESSAGE_T *message );
+
 // MSG_ID_ALARM_STATUS
 BOOL broadcastAlarmStatus( COMP_ALARM_STATUS_T almStatus );