As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: VENT SKIN VALVE FAULT ILLUMINATED DURING CLIMB. AIRCRAFT DIVERTED TO PHL WHERE IT LANDED SAFELY WITHOUT FURTHER INCIDENT.(NO EMERGENCY WAS DECLARED) MAINTENANCE FOUND THE CANNON PLUG 21HQ-A DISCONNECTED FROM CONDITIONED AIR ISOLATION VALVE, RECONNECTED CANNON PLUG AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 21-26-54-401 AND 21-26-00-710-001-A.