Index: firmware/App/Monitors/Pressures.c
===================================================================
diff -u -r8740324a3f7730bdf614df73dcab916f35d03bce -r3fceee65945cede3526a91d57148ffe1deb0c70e
--- firmware/App/Monitors/Pressures.c	(.../Pressures.c)	(revision 8740324a3f7730bdf614df73dcab916f35d03bce)
+++ firmware/App/Monitors/Pressures.c	(.../Pressures.c)	(revision 3fceee65945cede3526a91d57148ffe1deb0c70e)
@@ -8,7 +8,7 @@
 * @file    Pressures.c
 *
 * @author  (last)      Varshini Nagabooshanam
-* @date    (last)      11-Dec-2025
+* @date    (last)      04-Feb-2026
 *
 * @author  (original)  Sean Nash
 * @date    (original)  24-Sep-2024
@@ -64,24 +64,21 @@
 #define ARTERIAL_PRESSURE_SELF_TEST_MAX     ( 100.0F )                                      ///< Maximum self-test value for arterial pressure sensor reading (in mmHg).
 #define ARTERIAL_PRESSURE_MAX_MMHG          ( 2000.0F )                                     ///< Maximum arterial pressure reading (in mmHg) for range check.
 #define ARTERIAL_PRESSURE_MIN_MMHG          ( -1500.0F )                                    ///< Minimum arterial pressure reading (in mmHg) for range check.
-#define ARTERIAL_PRESSURE_LIMIT_WINDOW_DEFAULT_MMHG       ( 200.0F )                        ///< Default Arterial pressure limit window (mmHg). Used as Window/2 for min/max limits
 #define ARTERIAL_PRESSURE_LIMIT_MAX_MMHG    ( 100.0F )                                      ///< Maximum arterial pressure limit (in mmHg).
 #define ARTERIAL_PRESSURE_LIMIT_MIN_MMHG    ( -300.0F )                                     ///< Minimum arterial pressure limit (in mmHg).
 
 #define VENOUS_PRESSURE_SELF_TEST_MIN       ( -100.0F )                                     ///< Minimum self-test value for venous pressure sensor reading (in mmHg).
 #define VENOUS_PRESSURE_SELF_TEST_MAX       ( 100.0F )                                      ///< Maximum self-test value for venous pressure sensor reading (in mmHg).
 #define VENOUS_PRESSURE_MAX_MMHG            ( 2000.0F )                                     ///< Maximum venous pressure reading (in mmHg) for range check.
 #define VENOUS_PRESSURE_MIN_MMHG            ( -1500.0F )                                    ///< Minimum venous pressure reading (in mmHg) for range check.
-#define VENOUS_PRESSURE_LIMIT_WINDOW_DEFAULT_MMHG          ( 200.0F )                       ///< Default Venous pressure limit window (mmHg). Used as Window/2 for min/max limits.
 #define VENOUS_PRESSURE_LIMIT_MAX_MMHG      ( 400.0F )                                      ///< Maximum venous pressure limit (in mmHg).
 #define VENOUS_PRESSURE_LIMIT_MIN_MMHG      ( 20.0F )                                       ///< Minimum venous pressure limit (in mmHg).
 #define VENOUS_PRESSURE_EXEMPTION_PERIOD    ( ( 2 * MS_PER_SECOND ) /  \
                                                TASK_GENERAL_INTERVAL )                      ///< Venous pressure low exemption period (in task interval) after fill for all blood flow rate
 
-#define TMP_PRESSURE_LIMIT_WINDOW_DEFAULT_MMHG    ( 200.0F )                                ///< Default TMP pressure limit window (mmHg). Used as Window/2 for min/max limits.
 #define TMP_PRESSURE_LIMIT_MAX_MMHG               ( 500.0F )                                ///< Maximum transmembrane pressure limit (in mmHg)
 #define TMP_PRESSURE_LIMIT_MIN_MMHG               ( -500.0F )                               ///< Minimum transmembrane pressure limit (in mmHg)
-#define TMP_PRESSURE_HIGH_ABSOLUTE_MMHG           ( 500.0F )                                ///< Transmembrane pressure high absolute (in mmHg)
+#define TMP_PRESSURE_HIGH_ABSOLUTE_MMHG           ( 500.0F )                                ///< Transmembrane pressure high absolute (in mmHg).
 #define TMP_ALARM_PERSISTENCE                     ( ( 1 * MS_PER_SECOND ) / TASK_GENERAL_INTERVAL )   ///< Alarm persistence period for transmembrane pressure alarms
 
 #define MIN_TIME_BETWEEN_AIR_TRAP_FILL_EXEMPTIONS_MS        ( 1200 )                        ///< To monitor low Venous pressure in the defined interval in a case where continuous air fill event happens followed by exemption period to stabilize the pressure
@@ -1176,7 +1173,42 @@
     return result;
 }
 
+/*********************************************************************//**
+* @brief
+* The validatePressureLimitWidenRequest function handles pressure limit
+* widening request received from the UI.
+* @details Message Received: MSG_ID_UI_PRESSURE_LIMIT_WIDEN_REQUEST
+* @details Message Sent: MSG_ID_TD_PRESSURE_LIMIT_WIDEN_RESPONSE
+* @param message request message from UI
+* @return TRUE if request accepted, FALSE otherwise
+*************************************************************************/
+BOOL validatePressureLimitWidenRequest( MESSAGE_T *message )
+{
+    BOOL result = FALSE;
+    REQUEST_REJECT_REASON_CODE_T rejReason = REQUEST_REJECT_REASON_INVALID_REQUEST_FORMAT;
+    UI_RESPONSE_PAYLOAD_T response;
 
+    // Verify message payload length
+    if ( message->hdr.payloadLen == 0 )
+    {
+        // Apply widened pressure limits
+        setPressureLimitsToOuterBounds();
+        // Restart stabilization
+        stabilizationStartTimeMs = getMSTimerCount();
+        currPresLimitsState = PRESSURE_LIMITS_STATE_STABILIZATION;
+        result = TRUE;
+        rejReason = REQUEST_REJECT_REASON_NONE;
+    }
+
+    // Respond to request
+    response.accepted = result;
+    response.rejectionReason = rejReason;
+    sendMessage( MSG_ID_TD_PRESSURE_LIMIT_WIDEN_RESPONSE, COMM_BUFFER_OUT_CAN_TD_2_UI, (U08*)(&response), sizeof( UI_RESPONSE_PAYLOAD_T ) );
+
+    return result;
+}
+
+
 /*************************************************************************
  *                       TEST SUPPORT FUNCTIONS
  *************************************************************************/