Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -r2fbfc45cea26e36bc8295d4c81c48bb597ca63d3 -r9a11f0c0584c74d169032b5fd8c041c32b7d332f
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 2fbfc45cea26e36bc8295d4c81c48bb597ca63d3)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 9a11f0c0584c74d169032b5fd8c041c32b7d332f)
@@ -737,6 +737,8 @@
                 stabilizationStartTimeMs = getMSTimerCount();
                 pressureStabilizeTime = STABILIZATION_PERIOD_OFF;
                 currPresLimitsState = PRESSURE_LIMITS_STATE_STABILIZATION;
+                // Open air trap valve to clear any accumulated bubbles
+                signalAirTrapValveOpen();
             }
             break;