As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW NOTED THAT AIRCRAFT WOULD NOT PRESSURIZE ABOVE 5 PSI. SUBSEQUENT INSPECTION BY MAINTENANCE REVEALED THAT THE AFT CARGO DOOR BULKHEAD WAS CRACKED AT FS 869.0 TO FS 903.0, RBL 60, WL 191. CARGO DOOR REPLACED IAW SMP 581 52-30, LOG PAGE 30066 ITEM 1.