As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATL/MBJ - FLT JM 052 - AIRCRAFT RETURNED ATLANTA DUE UNABLE TO PRESSURIZE. OPERATION OF DOOR INVOLVED WAS CONFIRMED TO BE ABLE TO BE CLOSED INCOMPLETELY WITHOUT GIVING A ''''DOOR OPEN'''' INDICATON. ENGINEERING DEPARTMENT HAS BEEN NOTIFIED TO CONTACT BOEING REGARDING THIS POSSIBLE HAZARD. (X)