What was found
FLT#426, TPA-JFK. (AIRCRAFT PERFORMED AN AIR TURN BACK TO TPA). 'ON CLIMB OUT V/S INDICATED EXCESSIVE CABIN CLIMB. CABIN ALTITUDE STARTED TO CLIMB ABOVE NORMAL LIMITS. APOUND 18,000 FT RECIEVED EXCESSIVE CABIN ALTITUDE ECAM WARNING. EXECUTED EMERGANCY DESCENT AND RETURN TO TPA. CABIN PRESSURE SYSTEM 2 FAULT RECIEVED ON RETURN TO TPA. ( AUTOMATIC CABIN PRESSURE CONTROL SYSTEM-CPC2 ); PERFOMED RESET OF CPC 2/ MANUAL SELECT. CPC 2 TEST OK AT THIS TIME I.A.W AMM 21-31-00-710-002. NO MSG PRESENT. A/C OK FOR CONT SVC. MDDR CLEARED. MX-4 UPDATED. PLACARD REMOVED.