As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#2144, LGW-JFK. (ETOPS) 'ON COCKPIT POWER UP ECAM: AVIONICS VENT FAULT. UNABLE TO RESET. FOUND SKIN AIR OUTLET VALVE SEIZED IN OPEN POSITION. UNABLE TO SECURE VALVE CLOSE; REMOVED AND REPLACED SKIN AIR OUTLET VALVE IAW AMM 21-26-53. OP'S CHECK IS GOOD. A/C OK FOR SERVICE.