As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT MAIN LANDING GEAR UNSAFE LIGHT REMAINED ON AFTER GEAR RETRACTION. CREW PERFORMED UPLATCH CHECK AND GEAR DOOR OPEN LIGHT ILLUMINATED. FLIGHT WAS RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE CLEANED AND LUBED LEFT MAIN GEAR DOOR LATCH MECHANISM AND UPPER DOOR SEQUENCE CABLE. OPERATIONAL CHECK NORMAL ON GEAR SWING. AIRCRAFT RETURNED TO SERVICE.