As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ZONE TEMP LIGHT CAME ON DURING AFTER START. LIGHT WENT OUT AFTER RESETTING. GROUNDED - YES. HAD FLIGHT DECK TRIM VALVE FAULT. REMOVED AND REPLACED FLIGHT DECK TRIM VALVE MODULATING VALVE, IAW B737-800 AMM 21-61-21-000-801 AND AMM 21-61-21-400-801. ETOPS GROUND FUNCTIONAL CHECK GOOD, IAW AMM 21-61-00-700-806-002.