As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON APPROACH, AT 20 MILES OUT AND 2500 FT ASL THE CABIN DOOR OPENED. FLIGHT SERVICES WAS INFORMED AND THE AIRCRAFT LANDED UNEVENTFULLY. THE COPILOT CLOSED THE DOOR AFTER LANDING. THE DOOR AND SURROUND WERE INSPECTED NO DAMAGE FOUND.