What was found
ON DESCENT, ECAM WARNING: CABIN PRESSURE EXCESS, CABIN ALT AND CABIN PRESSURE LOW DIFF PRESSURE. CABIN ALTITUDE CLIMBED TO OVER 8800 FT. EMERGENCY WAS DECLARED AND THE FLIGHT LANDED UNEVENTFULLY. REPLACED THE RT PACK FCV, FLOW CONTROL VALVE. THE LT PACK WAS PREVIOUSLY INACTIVE AND DEFERRED ON MEL. IT WAS REPAIRED BY THE REPLACEMENT OF THE LT PACK, ACM TESTED NORMALLY AND RETURNED TO SERVICE.