As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
R AFT CABIN DISPLAYED ON UPPER ECAM SCREEN. DOOR CREW COMMENTS: R AFT CABIN DOOR SHOWED OPEN IN FLIGHT. CABIN PRESSURIZATION CONTROL WAS LOST IN AUTO AND MANUAL. SAMC TEXT: **CREW REPORTED LOST PRESS AT APPROX 8000FT AGL. UNABLE TO REGAIN CONTROL IN AUTO OR MANUAL. AFTER THE EVENT, ALSO HAD DOOR 2R ECAM COME ON. FLT ATTND IN AFT CABIN DID NOT HEAR OR SEE PROBLEM WITH DOOR 2R DURING THIS TIME. DURING PRESSURIZATION CHECK FOUND OUTFLOW VLV FLUCTUATING. REPLACED AND RETESTED. TEST WAS NORMAL.