Index: AlarmDefs.h
===================================================================
diff -u -r8a40366d0904d5e0700485c02757708cf9f13e57 -r5912d2cd18e412e3e8a48013954c9bea2e0b5362
--- AlarmDefs.h	(.../AlarmDefs.h)	(revision 8a40366d0904d5e0700485c02757708cf9f13e57)
+++ AlarmDefs.h	(.../AlarmDefs.h)	(revision 5912d2cd18e412e3e8a48013954c9bea2e0b5362)
@@ -339,6 +339,7 @@
     ALARM_ID_DG_PRIMARY_HEATER_POWER_VOLTAGE_OUT_OF_RANGE = 301,            ///< DG primary heater power voltage out of range
     ALARM_ID_DG_CPU_RAM_ERROR = 302,                                        ///< DG processor RAM error
     ALARM_ID_HD_SERVICE_TIME_INTERVAL_HAS_ELAPSED = 303,                    ///< HD service time interval has elapsed
+    ALARM_ID_HD_INVALID_USAGE_RECORD_CRC = 304,                             ///< HD invalid usage record
     NUM_OF_ALARM_IDS                                                        ///< Total number of alarms
 };
 typedef enum Alarm_List ALARM_ID_T;                                 ///< Type for alarm list enumeration
@@ -773,6 +774,7 @@
     { ALARM_PRIORITY_HIGH,     3,  FALSE, TRUE , TRUE , TRUE , TRUE , TRUE , FALSE, FALSE, FALSE, TRUE , FALSE, FALSE, ALARM_ID_DG_PRIMARY_HEATER_POWER_VOLTAGE_OUT_OF_RANGE,     0,              ALARM_ID_NO_ALARM },
     { ALARM_PRIORITY_HIGH,   999,  TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , FALSE, TRUE , FALSE, FALSE, ALARM_ID_DG_CPU_RAM_ERROR,                                 0,              ALARM_ID_NO_ALARM },
     { ALARM_PRIORITY_MEDIUM, 899,  FALSE, FALSE, TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , FALSE, FALSE, ALARM_ID_HD_SERVICE_TIME_INTERVAL_HAS_ELAPSED,             0,              ALARM_ID_NO_ALARM },
+    { ALARM_PRIORITY_HIGH,     1,  FALSE, TRUE , TRUE , TRUE , TRUE , TRUE , FALSE, FALSE, FALSE, TRUE , FALSE, FALSE, ALARM_ID_HD_INVALID_USAGE_RECORD_CRC,                      0,              ALARM_ID_NO_ALARM },
 };  //   Priority            Rank  Fault DFault Stops  ClrIm  NoClr  NoRes  NoRin  NoEnd  NoBRcr NoDRcr ClrOnly TxLog  ID                                                        Escalate In     Escalate To
 
 /// Table of alarms and their rank.
@@ -819,6 +821,7 @@
     {   1, ALARM_ID_HD_RTC_OR_TIMER_ACCURACY_FAILURE },
     {   1, ALARM_ID_DG_DIALYSATE_FLOW_SENSOR_INVALID_CAL_RECORD },
     {   1, ALARM_ID_DG_RO_FLOW_SENSOR_INVALID_CAL_RECORD },
+    {   1, ALARM_ID_HD_INVALID_USAGE_RECORD_CRC },
     {   3, ALARM_ID_HD_INVALID_SYSTEM_RECORD_CRC },
     {   3, ALARM_ID_HD_INVALID_SERVICE_RECORD_CRC },
     {   3, ALARM_ID_HD_SOFTWARE_FAULT },
Index: MsgDefs.h
===================================================================
diff -u -r9fd561289142081f43c4ed8c73a5fd1e24340266 -r5912d2cd18e412e3e8a48013954c9bea2e0b5362
--- MsgDefs.h	(.../MsgDefs.h)	(revision 9fd561289142081f43c4ed8c73a5fd1e24340266)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision 5912d2cd18e412e3e8a48013954c9bea2e0b5362)
@@ -168,7 +168,7 @@
     MSG_ID_DG_SERIAL_NUMBER = 0x88,                                     ///< DG serial number
     MSG_ID_UI_REQUEST_SERVICE_INFO = 0x89,                              ///< UI request for service schedule information
     MSG_ID_HD_SERVICE_SCHEDULE_DATA = 0x8A,                             ///< HD service schedule data
-    MSG_ID_HD_USAGE_DATA = 0x8B,                                        ///< HD usage data TODO is this needed?
+    MSG_ID_HD_USAGE_DATA = 0x8B,                                        ///< HD usage data
     MSG_ID_DG_SERVICE_SCHEDULE_DATA = 0x8C,                             ///< DG service schedule data
     MSG_ID_DG_USAGE_DATA = 0x8D,                                        ///< DG usage data
     MSG_ID_HD_POST_SINGLE_TEST_RESULT = 0x8E,                           ///< HD POST single test result
@@ -195,7 +195,7 @@
     MSG_ID_HD_FANS_DATA = 0xA3,                                         ///< HD fans data publish
     MSG_ID_HD_EVENT = 0xA4,                                             ///< HD general event
     MSG_ID_DG_EVENT = 0xA5,                                             ///< DG general event
-    MSG_ID_DG_DIALYSATE_FLOW_METER_DATA = 0xA6,   // TODO remove when DEN-13460 merged             ///< DG dialysate flow meter data (liter/minute)
+    MSG_ID____AVAILABLE_4 = 0xA6,                                       ///< This message is available for use
     MSG_ID_DG_ALARM_INFO = 0xA7,                                        ///< DG alarm information data publish
     MSG_ID_HD_RESERVOIRS_DATA = 0xA8,                                   ///< HD reservoirs data publish
     MSG_ID_HD_REQUEST_DG_CONCENTRATE_MIXING_RATIOS = 0xA9,              ///< HD request DG concentrate ratios