What was found
AIRCRAFT WAS GROUNDED. CLIMBING THRU FL290 PRESS ADU PAGE DISPLAYED AS CABIN PRESS INCREASED ABOVE 8000. STOPPED OUR CLIMB AND WENT TO FL280. CAB CONTINUED TO CLIMB PAST 9400 UNTIL ECAM WARNING. STARTED EMERGENCY DECENT AND REGAINED CABIN AT FL240. OUTFLOW VALVE SHOWED FULL CLOSED ENTIRE TIME. AIRCRAFT RETURNED TO MIA WHERE IT LANDED SAFELY WITHOUT FURTHER INCIDENT. FOUND AFT CARGO DOOR FORWARD AND AFT SIDE SEAL TORN 6-8 INCHES AT EACH LOCATION. REMOVED & REPLACED AFT CARGO DOOR SEAL, PER AMM 52-32-11, ALL REQUIRED TEST ACCOMPLISHED. ALSO BITE CABIN PRESS CONTROLLERS 1 & 2 WITH NO FAULTS.