As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1858, AUA-JFK. (AIRCRAFT PERFORMED AN AIR TURNBACK TO AUA) ' VENT SKIN VALVE FAULT AFTER TAKE OFF APPLIED ECAM ( SKIN AIR OUTLET VALVE (AVIONICS)); REACTIVATED THE AVIONICS SKIN EXCHANGER ISO AND SKIN AIR OUTLET VALVE IAW AMM 21-26-00. THE OPS CHECK IS GOOD. THIS CLEARS MDDR 496520. MX-4 UPDATED. PLACARD REMOVED.'