As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSENGER AIRSTAIR DOOR OPENED IMMEDIATELY AFTER TAKEOFF ON DATE MAY 26, 2010 WHILE ACFT WAS GETTING AIRBORNE. THE ACFT RETURNED AND LANDED SAFELY BACK AT THE AIRPORT OF DEPARTURE. THE INCIDENT HAS BEEN INVESTIGATED AND THE FAULTY DOOR WARNING SYS WAS REPAIRED AND THE ACFT RETURNED TO SERVICE WITHOUT FURTHER INCIDENT.