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. RECYCLED GEAR WITH SAME RESULTS. SPEED WAS INCREASED TO 290 KNOTS AND GEAR DOOR OPEN LIGHT ILLUMINATED. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LEFT MAIN GEAR DOOR SWITCH, OPERATIONAL CHECK NORMAL ON GEAR CYCLE.