What was found
ACRT WAS GROUNDED: ACRT RETURNED TO MIA DUE TO THE FLT CREW REPORTING THAT AFTER TAKEOFF RECEIVED CABIN PRESSURE SYS 1 & 2 ECAM FAULTS. FLT CREW ACCOMPD ECAM PROCEDURES BUT WERE UNABLE TO CONTROL PRESSURIZATION SYS MANUALLY. SUBSEQUENTLY RECEIVED CABIN PRESSURE SAFETY VALVE OPEN INDICATION. THE ACFT LANDED SAFELY AT MIA WITHOUT FURTHER INCIDENT. MAINT REPLACED THE NR 1 CABIN PRESSURE CONTROLLER 11HL (AALA202603118095) AND THE NR 2 CABIN PRESSURE CONTROLLER 12HL (AALA202603117222) IAW AMM 21-31-34. MAINTENANCE ALSO REPLACED CABIN PRESSURE SAFETY VALVE 6HL (AALA202603112750) AND CABIN PRESSURE SAFETY VALVE 7HL (AALA202603110719) PER AMM 21-31-00. A SATISFACTORY OPS CHK WAS ACCOMPLISHED WITH NO FAULTS.