What was found
AIRCRAFT GROUNDED - ON CLOSING PASSENGER/CREW DOOR, CABIN BEGAN TO PRESSURIZE. ECAM: CABIN PR SYS 1 & 2 FAULT. AUTO PRESSURIZATION INOPERATIVE, HAD TO MANUALLY DEPRESSURIZE. UNABLE TO ACCESS CONTROLLERS FOR BITE CHECK. TROUBLESHOOTING PER FAULT ISOLATION MANUAL AND WIRE DIAGRAM. FAULT ASSOCIATED WITH #1 LGCIU (LANDING GEAR CONTROL AND INTERFACE UNIT). REMOVED AND REPLACED #1 LGCIU (AALA202008149018) PER AMM 32-31-71, NO FIX. REMOVED AND REPLACED #2 CABIN PRESSURE CONTROLLER (AALA202008149016) PER AMM 21-31-34, OPERATIONAL CHECK NORMAL.