What was found
AFTER TAKEOFF FROM PIT EN ROUTE FOR PHX RECEIVED ECAM MESSAGE FOR VENT SKIN AIR VALVE FAULT. COMPLIED WITH ECAM INSTRUCTIONS AND DIVERTED TO CMH. MAINTENANCE FOUND AVIONICS EQUIPMENT VENTILATION COMPUTER (AEVC) FAULTING 22HQ SKIN/AIR VALVE. VALVE WAS PREVIOUSLY ON MEL AND WAS LOCKED OUT. REMOVED AND REPLACED SKIN/AIR VALVE IAW T/C R2A21301. DURING OPERATIONAL TEST PRESSURE SWITCH 17HQ FAULTED, REMOVED AND REPLACED PRESSURE SWITCH IAW AMM 21-26-11-04. OPERATIONAL TEST OF AEVC SYSTEM WAS GOOD PER T/C F1B21301. PART NAME; SWITCH PRESSURE, MFG; IN LHC GROUPE, P/N 1209-100, LOC; ZONE 121.