What was found
DURING CLIMB OUT, CREW RECEIVED AN ECAM VENT SKIN VALVE FAULT. RAN ECAM, UNABLE TO PRESSURIZE. FLIGHT RETURNED TO FIELD & LANDED WITHOUT INCIDENT. FOUND AEVC FAULTY IAW TSM 21-26-34. REMOVED & INSTALLED SERVICEABLE AEVC AMM 21-26-34-400-001A. OPS TEST OF VENTILATION SYS OF AVIONICS EQUIPMENT, TESTED GOOD, NO FAULTS.