As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN FAILED TO PRESSURIZE ON CLIMB OUT-UNABLE TO MAINTAIN CABIN IN MANUAL MODE-F/A REQ MX DUE MASSIVE LEAK L-2 DOOR-MX REPORTED MASSIVE LEAK AND DAY LIGHT AROUND L-2 DOOR. ACFT RETURNED TO DEPARTURE WHERE FLIGHT WAS TERMINATED. MX ON THE GROUND INSPECTED AC L-2 DOOR AND FOUND DOOR SEAL HAD BLOWN OUT.