As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START, UPON MASTER RECALL, FWD CABIN ZONE TEMP LIGHT COMES ON. FLIGHT CREW ENROUTE MEL. ACFT GROUNDED. ZONE TEMP CONTROLLER NR 2 FAULTED: FWD CABIN TRIM MODULATION VALVE. REF, AMM 21-61-00. REPLACED FWD CABIN TRIM MOD VALVE WITH NEW. REF: AMM 21-61-21. ZONE TEMP CONTROLLER BIT TEST GOOD.