As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - FLT 0880 - AFTER TAKEOFF MIA/PHL - GEAR AND TAIL SKID UNSAFE LIGHTS REMAINED ILLUMINATED WHEN GEAR HANDLE WAS IN UP AND OFF POSITION. GEAR OPERATION WAS NORMAL. AIRCRAFT LANDED PHL WITHOUT INCIDENT. REPLACED LANDING GEAR ACTUATION UNIT. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)