As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK DUE TO INABILITY TO PRESSURIZE THE CABIN AFTER TAKE-OFF. ECAM WARNING: CAB PR EXCESS CAB ALT . QRH PROCEDURE WAS CARRIED OUT AND PRESSURIZATION WAS NORMAL IN MANUAL MODE. AFTER REVIEWING THE ECS REPORT 19, ETS REQUESTED BOTH CPC-1 AND CPC-2 BE REPLACED AND RE-LOAD THE NAV DATA BASE ON BOTH FMGC.