As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AN OUTFLOW VALVE TEST WITH THE AIRCRAFT PRESSURIZED, MAINTENANCE REPORTED A LOUD POP IN THE AREA OF THE AFT CARGO DOOR AND FOUND A 5-INCH CRACK IN THE RADIUS OF THE DOOR FRAME OTBD OF THE LOWER FWD STOP FITTING AND CRACKS IN THE LOWER DOOR BEAM OTBD CHORD AND WEB. REPLACED THE AFT CARGO DOOR.