What was found
AIR RETURN TO DEPARTURE DUE TO PRESSURIZATION ISSUES IMMEDIATELY AFTER TAKE OFF. NO EMERGENCY DECLARED. VENT SKIN VALVE FAULT ECAM PROCEDURE FOLLOWE PER MEL 21-26-04 NOTE 3. UNABLE TO CONTROL CABIN WITH MAN V/S CTL SWITCH INDICATED XX ON LOWER ECAM. GROUNDED - YES. PERFORMED INSPECTION OF SKIN OUTLET VALVE 22HQ, FOUND AUXILIARY VALVE TO NOT BE FULLY OPEN PER MEL 21-26-04, FOR CORRECTIVE ACTION SEE LOGPAGE 1196285 ITEM 3, MDDR # 63770, PERFORMED AIRCRAFT PRESSURIZATION TEST PER AMM 05-53-00. OPS CHECK GOOD. REMOVED & REPLACED SKIN AIR OUTLET VALVE 22HQ, PER AMM 21-26-53, OPS CHECK GOOD, AIRCRAFT PLACED BACK IN NORMAL CONFIGURATION. PERFORMED AIRCRAFT PRESSURIZATION TEST PER AMM 05-53-00. OPS CHECK GOOD, THIS CLEARS MDDR 63770, MCC COREY NOTIFIED, MEL LIST UPDATED.