As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON T/O WE HAD A ZONE TEMP FAULT RETURNED TO AIRPORT. DEACTIVATED PACK AIRFLOW SHUTOFF VALVE AND PLACE LEFT PACK ON DEFERRAL. THIS IS A CHRONIC ITEM SEE FUP LOG 6621858. COMPLIED WITH DDP IN REF WITH MEL 2101A. PERFORMED DCPC BITE AND FMC DISCRETE TEST THEN DEACTIVATED PACK AIRFLOW SHUTOFF VALVE AND PLACE LEFT PACK ON DEFERRAL. LT PACK RUNNING HOT.. PERFORM BOTH PZTC BITE CK REF FIM 21-62 TASK 801, PERFORMED PZTC BITE CK REF FIM 21-62 TASK 801 OF BOTH CONTROLLERS, NO FAULTS PRESENT.