As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON RECALL, GOT FWD CAB ZONE TEMP LIGHT. EXTINGUISHES WITH MASTER CAUTION RESET. TEMPS NORMAL. ACFT GROUNDED. PERFORMED ZONE TEMP CONTROLLER BITE ON BOTH CONTROLLERS IAW FIM 21-62, TASK 801, FOUND NR 2 CONTROLLER ZONE TRIM VALVE FAULT. REPLACED FWD CAB ZONE TRIM VALVE IAW AMM 21-62-01.