As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING T/C 31-005-00 SMTPACK CONTROL CHANNEL L: MX MSG 21-55130 LEFT AIR CONDITIONING PACK INLET PRESSURE SENSOR IS OUT OF RANGE "MAINT" LIGHT ILLUMINATED. GROUNDED - YES. ACCOMPLISHED B737-9 IFIM 21-51-00-810-824 LEFT PACK INLET PRESSURE SENSOR REPLACED REF B737-9 AMM 21-61-23 LEAK CHECK GOOD "MAINT" LIGHT EXTINGUISHED NO FAULTS ACTIVE.