What was found
AFTER TAXI IN, ENGINES OFF, ZERO CABIN PRESSURE, COCKPIT WINDOWS OPENED ECAM WARNING AND ALARM CABIN EXCESS RESIDUAL PRESSURE. ACFT GROUNDED. IAW TSM 21-31-00-810-845-A, PERFORMED AN OPERATIONAL TEST OF THE PRESSURE CONTROL AND MONITORING IAW AMM 21-31-00-710-002-A. NO FAULTS NOTED.