As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALL THREE MAIN LANDING GEAR RED UNSAFE LIGHTS REMAINED ON AFTER GEAR RETRACTION. CREW RECYCLED GEAR WITH SAME RESULTS. FLIGHT RETURNED TO MEM AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THROTTLE LIMIT SWITCHES, OPERATIONAL CHECK NORMAL.