As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT MAIN GEAR UNSAFE LIGHT REMAINED ON AFTER GEAR RETRACTED ALONG WITH GEAR INTRANSIT LIGHT IN HANDLE. QRH PROCEDURES COMPLETE BUT GEAR STILL INDICATED UNSAFE. GEAR LOCKED DOWN NORMALLY AND INDICATED NORMALLY. AIR RETURN TO MSP. MAINTENANCE CND PROBLEM CLEANED AND LUBED LT GEAR DOOR UP LOCK MECHANISM. COMPLETED SEVERAL GEAR SWINGS, ALL CHECKS GOOD.