As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING ASA T/C 31-005-00. FOUND SMT PACK CONTROL CHANNEL L MAINT MESSAGE 21-55230 FAULT CODE 21545141. LEFT AIR CONDITIONING INLET PRESSURE SENSOR IS OUT OF RANGE. GROUNDED - YES. REMOVED & REPLACED L/H PRESSURE SENSOR REF B737-9 AMM 47-43-04 OPS CHECK GOOD.