What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INBOUND INTO CLT. THE FLIGHT CREW REPORTED A LOSS OF CABIN PRESSURIZATION AT FL350. AIRCRAFT WAS DISPATCHED WITH A SINGLE-PACK OPERATIVE SINCE THE RIGHT PACK WAS DEFFERED AND INOPERATIVE. AT FL350 NOTICED CABIN PRESSURE/ALTITUDE INCREASING (9000 100FPM), FLIGHT CREW INITIATED DESCENT, SUBSEQUENT ECAM CABIN PRESSURIZATION EXCESS / CABIN ALT MESSAGE DISPLAYED. CABIN REACHED MAX 11,500, FLIGHT DECK CREW O2 ONLY, THERE AFTER (3 MINUTES), ECAM CAB PR SYS 1 + 2 FAULT (LEFT PACK FAILED/OFF, CONFIRMED ON OVERHEAD PANEL). CABIN O2 MASK NOT DEPLOYED. THE AIRCRAFT LANDED SAFELY AT CLT AND TAXIED TO THE GATE UNDER ITS OWN POWER. MAINTENANCE REPLACED THE # 1 FLOW CONTROL VALVE PER AMM 21-51-51 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK WITH NO FAULTS NOTED.