Index: DDDefs.h
===================================================================
diff -u -rcb91895532f77164daecf4df7f703372067eb644 -r565e9b1e27d09679de6d61a584ff5c1aa0371900
--- DDDefs.h	(.../DDDefs.h)	(revision cb91895532f77164daecf4df7f703372067eb644)
+++ DDDefs.h	(.../DDDefs.h)	(revision 565e9b1e27d09679de6d61a584ff5c1aa0371900)
@@ -7,8 +7,8 @@
 *
 * @file    DDDefs.h
 *
-* @author  (last)      “Raghu
-* @date    (last)      14-Oct-2025
+* @author  (last)      Varshini Nagabooshanam
+* @date    (last)      26-Dec-2025
 *
 * @author  (original)  Sean Nash
 * @date    (original)  01-Aug-2024
@@ -307,7 +307,8 @@
     DD_EVENT_SUB_MODE_CHANGE,                                           ///< DD Op sub-mode change event
     DD_EVENT_OPERATION_STATUS,                                          ///< DD operation status event
     DD_EVENT_D6_LEVL_CHANGE,                                            ///< DD floater level change event
-    DD_EVENT_D63_LEVL_CHANGE,                                           ///< DD bicarb level change event
+    DD_EVENT_D63_LEVL_CHANGE,                                           ///< DD bicarb upper level change event
+    DD_EVENT_D98_LEVL_CHANGE,                                           ///< DD bicarb lower level change event
     DD_EVENT_D46_LEVL_CHANGE,                                           ///< DD spent dialysate air seperation level change event
     DD_EVENT_TD_COMMUNICATION_LOSS,                                     ///< DD TD communication loss
     DD_EVENT_TEMPERATURE_DRIFT,                                         ///< DD dialysate temperature drift
@@ -392,12 +393,12 @@
     LAST_BC_VALVE = D22_VALV,                     ///< End of Balancing Chamber valve group
     D79_PMP_VALV,                                 ///< D79 Pump mapped to Spare valve 0
     FIRST_SP_VALVE = D79_PMP_VALV,                ///< First spare valve
-    SPARE1_VALV,                                  ///< Spare Valve 1
-    SPARE2_VALV,                                  ///< Spare Valve 2
+    D83_VALV,                                     ///< D83 Valve mapped to Spare valve 1
+    D91_VALV,                                     ///< D91 Valve mapped to Spare valve 2
     SPARE3_VALV,                                  ///< Spare Valve 3
     SPARE4_VALV,                                  ///< Spare Valve 4
     SPARE5_VALV,                                  ///< Spare Valve 5
-    SPARE6_VALV,                                  ///< Spare Valve 6
+    D100_VALV,                                    ///< D100 Valve mapped to Spare valve 6
     SPARE7_VALV,                                  ///< Spare Valve 7
     LAST_SP_VALVE = SPARE7_VALV,                  ///< Last spare valve
     LAST_DD_VALVE = LAST_SP_VALVE,                ///< Last DD valve