As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONTINUOUS ZONE TEMP ANNUNCIATOR ON TAXI, MASTER RECALL GOES OUT WITH MASTER CAUTION RESET. GROUNDED - YES. PERFORMED PZTC BITE REF FIM 21-62 TASK 801. ON BOTH PZTC FLT DECK TRIM VALVE FAULTED. PUSHED VERIFY ON BOTH PZTC AND FAULTS CLEARED. FOUND FLIGHT DECK TEMP SENSOR DIRTY. PERFORMED CLEANING REF B737-800 AMM 21-61-10. OPERATED PACKS. NO FAULTS NOTED.