As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GEAR SELECTED UP ON FLIGHT 3411, LT GEAR UNSAFE LIGHT AND INTRANSIT LIGHT WOULD NOT EXTINGUISH ON RETRACTION. AIR RETURN TO MEM. MAINTENANCE REPLACED LT MAIN GEAR DOOR UPLOCK ACTUATOR PROXIMITY SWITCH. OPS CHECK GOOD IAW AMM 32-60-17. PN ON/OFF 8-018-01, SN/OFF 6940, SN/ON A53404.