As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONTROL CABIN ZONE TEMPERATURE ILLUMINATED ON RECALL. RESETS ON MASTER CAUTION RESET. ACFT GROUNDED. THE CONTROLLER FAULTED FLIGHT DECK TRIM VALVE. ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE IAW AMM 21-61-00, TEST PASSED. FAULT RESET.