As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP LIGHT EXTINGUISHES WITH MC RESET. GROUNDED - YES. BITE CHECK OF ZONE TEMP CONTROL #2 (M1443) FAULTED FLIGHT DECK TRIM VALVE. REPLACED TRIM VALVE(V143). BITE TEST PASSES NO LEAKS NOTED. REF B737-800 FIM 21-62 TASK 832 AND B737-800 AMM 21-61-21/401.