As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MSP - FLT 475 - AFTER TAKEOFF, THE LEFT AND RIGHT MLG DOWN LIGHTS STAYED ON WITH THE GEAR RETRACTED. THE AIRCRAFT RETURNED AND GEAR RETRACTION PERFORMED. ALL GEAR SWITCHES WERE CLEANED AND OPERATION WAS NORMAL. THE AIRCRAFT WAS RETURNED TO SERVICE. (M)