As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - CREW REPORTED LANDING GEAR WOULD NOT RETRACT WHEN HANDLE IS SELECTED UP. AFTER RESETTING MANUAL GEAR EXTENSION DOOR, GEAR OPERATED NORMAL. EMERGENCY DECLARED FLIGHT RETURNED PHL LANDED WITHOUT INCIDENT. INSPECTED DOOR LATCHES AND FOUND SERVICEABLE. CLEANED DOOR SWITCH. SYSTEM GROUND CHECK NORMAL OPERATION.