Index: DDDefs.h
===================================================================
diff -u -r6dcd6474798082bd6125fa7609c5b9d1e90c7b04 -rb1482aba19e14d3d0f46299399448e1bb1ee7fcc
--- DDDefs.h	(.../DDDefs.h)	(revision 6dcd6474798082bd6125fa7609c5b9d1e90c7b04)
+++ DDDefs.h	(.../DDDefs.h)	(revision b1482aba19e14d3d0f46299399448e1bb1ee7fcc)
@@ -7,8 +7,8 @@
 *
 * @file    DDDefs.h
 *
-* @author  (last)      “Raghu
-* @date    (last)      14-Oct-2025
+* @author  (last)      Varshini Nagabooshanam
+* @date    (last)      23-Jan-2026
 *
 * @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
@@ -378,8 +379,8 @@
     D3_VALV,                                      ///< Valve Hydraulics Inlet (D3)
     D80_VALV,                                     ///< Valve Dry Bicarb (D80)
     D81_VALV,                                     ///< Valve De-scaler (D81)
-    LAST_HYD_VALVE = D81_VALV,                    ///< End of Hydraulics valve of group
-    RSRVD_SPACE1,                                 ///< This space has been reserved
+    D85_VALV,                                     ///< Reserved space mapped for Valve (D85)
+    LAST_HYD_VALVE = D85_VALV,                    ///< End of Hydraulics valve of group
     FIRST_BC_VALVE,                               ///< Start of Balancing Chamber valve group
     D23_VALV = FIRST_BC_VALVE,                    ///< Balancing chamber Valve 1 (D23)
     D19_VALV,                                     ///< Balancing chamber Valve 2 (D19)
@@ -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