What was found
LANDED UNDER AMBER ALERT DUE TO FLUCTUATING CABIN PRESSURE. CABIN PRESSURE EXCESS CABIN ALTITUDE ON DESCENT. AFTER RAPID DESCENT, THEN GOT CABIN PRESSURE LOW DIFFERENTIAL PRESSURE AND SAFETY VALVE OPEN ECAM MESSAGES. CABIN PRESSURE CHANGES FELT BY CREW & PASSENGERS. HEARD AIR VENTING NOISE NEAR COCKPIT WINDOWS. NO BLEED OR PACK PROBLEMS NOTICED. SUPPLEMENTAL DATA UPDATE FLUCTUATING CABIN PRESSURE. EXCESS CABIN ALTITUDE ON DESCENT. AFTER DESCENT, CREW GOT CABIN PRESSURE LOW DIFFERENTIAL PRESSURE AND SAFETY VALVE OPEN ECAMS. CREW HEARD AIR VENTING NOISE NEAR FLIGHT DECK WINDOW. NO BLEED OR PACK PROBLEMS NOTICED. REPLACED N1 CABIN PRESSURE CONTROLLER PER MM 21-31-34. OP CHECKS GOOD. PRESSURIZED AIRCRAFT