As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE ACFT WAS OPERATING AND WHILE ON THE RETURN TRIP THE CREW REPORTED HEARING A LOUD BANG IN THE CARGO SECTION FOLLOWED BY THE INABILITY TO MAINTAIN CABIN PRESSURIZATION. NO EMERGENCY WAS DECLARED AND THE ACFT LANDED NORMALLY. MAINTENANCE REPORTED FINDING THE BEAM CRACKED.