As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AFTER TAKEOFF A GROUND SERVICE WAS LEFT OPEN. CREW RETURNED TO PHL AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND RESECURED DOOR CLOSED. MAINTENANCE FOUND NO DEFECTS IN ACCORDANCE WITH THE SMP. AIRCRAFT WAS RELEASED FOR SERVICE.