As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - CREW REPORTED AIRCRAFT DID NOT PRESSURIZE AND LOUD AIR LEAK AT LEFT NUMBER 1 DOOR AFTER TAKEOFF. EMERGENCY DECLARED FLIGHT RETURNED ORD LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND LEFT NUMBER ONE DOOR PRESSURE SEAL DAMAGED. ADJUSTED LEFT NUMBER 1 DOOR AND PERFORMED A SPLICE REPAIR ON DOOR SEAL. SYSTEM GROUND CHECK NORMAL OPERATION.