As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNPLANNED DSM STOP DUE TO LOSS OF CABIN PRESSURE. FOUND APU DUCT FLEXIBLE PRESSURE SEAL AT STA 1016 DAMAGED. REPLACED APU DUCT PRESSURE SEAL AND PRESSURIZED AIRCRAFT USING APU IN AUTO, STANDBY AND MANUAL TO ENSURE CORRECT OPERATION. NO DEFECT NOTED.