As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB OUT FROM KBIL THE FLIGHT CREW NOTICED LOSS OF PRESSURIZATION. DESCENDED AND RETURNED TO KBIL WITHOUT INCIDENT. UPON INSPECTION, IT WAS DISCOVER THAT THE CABIN DOOR SEAL HAD A CUT IN IT. MAINTENANCE REPLACED THE CABIN DOOR SEAL AND RETURNED THE AIRCRAFT TO SERVICE.