As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FORWARD CABIN ZONE TEMP ILLUMINATED ON PUSH BACK RESETS WITH MASTER CAUTION RESET. ACFT GROUNDED. ACFT CHECKED. PERFORMED ZONE TEMP CONTROLLER BITE TEST IAW AMM 21-61-00. NR 2 CONTROLLER SHOWS FAULT ON ZONE TRIM VALVE. FAULT CLEARS AFTER VERIFY AND FLT DECK CABIN ZONE TEMP LIGHT REMAINS EXTINGUISHED ON RECALL. R & R AND TESTED NR 2 AIR CONDITIONING ACCESSORY UNIT M1455 IAW AMM 21-51-02-000-801/21-51-02-400-801. ALL TESTS PASS. PACK ZONE TEMP CONTROLLER BITE IAW AMM 21-61-00-700-806-002. SHOWS NO FAULTS.