What was found
(CAN) ON CLIMBOUT CREW RECEIVED ECAM FAULT "VENT SKIN VALVE" AND UNABLE TO PRESSURIZE ACFT. FLIGHT RETURNED FOR MAINTENANCE, APPROXIMATE LANDING WEIGHT 65,700 KGS, CREW DID NOT DECLARE EMERGENCY WITH ATC. SKIN AIR OUTLET VALVE REPLACED IAW AMM 21-26-53 PB401. TESTED SERVICEABLE.