As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT DECK WARMER THAN SELECTED WITH SWITCH ON AND TEMP CONTROL IN AUTO INOP, LIGHT EXTINGUISHING. PRESS ECS REC BUTTON AND RECORD ZONE TEMPS. NEED FURTHER TROUBLESHOOTING USED PROCEDURE 1 PER MEL 2161E TRIM VALVE CLOSED ON EICAS. REPLACED FLIGHT DECK TRIM AIR MODULATING VALVE, OPS CHECK OKAY.