As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT DECK TEMP LIGHT CAME ON DURING CRUISE FLIGHT. FAULT CODE 21-90-63-00. MANUAL MODE WORKS, BUT THE COCKPIT TEMP BECAME VERY HIGH ON FINAL APPROACH. PERFORMED FAULT TREE 805 FIM 21-61 AND FOUND FLIGHT DECK TRIM AIR VALVE. REMOVED AND REPLACED FLIGHT DECK TRIM AIR VALVE IAW AMM 21-61-07 OPS CHECK GOOD. AC REMAINS ETOPS 180.