As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT UPON REACHING FL 130, UNABLE TO PRESSURIZE CABIN. ALL DOORS INDICATED CLOSED AND LOCKED AND CREW ELECTED TO RETURN TO DEPARTURE. AN EMERGENCY WAS NOT DECLARED AND CREW LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND A 3 INCH GASH IN THE AFT CARGO DOOR SEAL. MAINTENANCE R & R THE AFT CARGO DOOR SEAL IAW AMM AND OPS CHECKED GOOD. ACFT IS GOOD FOR SERVICE.