As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 719 FROM MCO TO MEM. AFTER GEAR RETRACTION, THE LEFT MAIN GEAR DOOR UNSAFE LIGHT REMAIN ON. RECYCLED THE GEAR CYCLE PER AOM PROCEDURES WITH NO HELP. AIR TURNBACK TO MCO AND LANDED WITHOUT INCIDENT. FOUND GEAR ACCESSORY UNIT FAILED. REPLACED LANDING GEAR ACCESSORY UNIT AND OPS CHECKED SYSTEM IAW MM 32-61-0. AIRCRAFT RETURN TO SERVICE.