As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - FLT 1511 - AFTER TAKEOFF PHL, NOSE GEAR WOULD NOT RETRACT. AIRCRAFT RETURNED TO PHL AND LANDED OVERWEIGHT WITHOUT INCIDENT. REPLACED NLG RETRACT CYLINDER. ACCOMPLISHED GEAR RETRACTION AND OVERWEIGHT LANDING INSPECTION WITH NO DEFECTS FOUND. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)