As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT LOST PRESSURIZATION IN FLIGHT. THE AIRCRAFT LANDED SAFELY WITHOUT INCIDENT. MX INSPECTED AND FOUND THAT THE MAIN CABIN DOOR SEAL HAD FAILED AT THE TOP OF THE DOOR FRAME CAUSING A DEFORMED SEAL SEAT ONTO THE DOOR FRAME. REPAIRS: REMOVED AND REPLACED THE MAIN CABIN DOOR SEAL.