As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT 3666, INFLIGHT AFTER TAKEOFF FROM MEM, RT GEAR INTRANSIT LIGHT AND RED HANDLE ILLUMINATED. AIR RETURN TO MEM. MAINTENANCE FERRIED TO MSP FOR FURTHER T/S AND REPAIR. MX REINSPECTED RT UPLOCK SENSOR FOUND BACKSHELL AT UPLOCK SENSOR RT MAIN GEAR COMPLETELY OFF CONNCTOR. CLEANED BACKSHELL AND CONNECTOR, REINSTALLED BACKSHELL AND PERFORMED TEST OF SENSOR OPERATION REF 32-60-17 501. TEST PASSES; OK FOR SERVICE.