As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT AFT CABIN TEMP UNCONTROLLABLE. ACFT GROUNDED. NR 1 CONTROLLER SHOWS AFT CABIN TEMP CONTROL TRIM VALVE FAIL. FOUND CONT CAB, FWD, AFT TEMP SENSORS CLOGGED. CLEANED SENSORS, NO HELP; AFT CABIN DRIVES TO FULL HOT. REPLACED RT AFT CABIN ZONE TRIM AIR MODULATING VALVE REF AMM 21-61-21-000-801 AND 21-61-21-400-801. BIT CHECKS GOOD, LEAK CHECK GOOD. ZONE TEMP CONTROL OPS NORMAL REF 21-61-00.