As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 1021 - AFTER TAKEOFF DFW WHEN LANDING GEAR RETRACTED, LT MLG UNSAFE MESSAGE ON MFDU. RECYCLED LANDING GEAR WITH SAME RESULTS. EXTENDED LANDING GEAR AND ALL INDICATIONS RETURNED TO NORMAL. AIRCRAFT RETURNED DFW AND LANDED WITHOUT INCIDENT. REPLACED LT MLG DOOR UP-STOP BUFFER. ACCOMPLISHED LANDING GEAR REETRACTION CHECK WITH NO DEFECTS FOUND. SYSTEM GROUND CHECKED NORMAL OPERATION. (X)