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 AND GEAR DOOR OPEN LIGHTS ILLUMINATED AFTER TAKEOFF. FLIGHT WAS RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED MAIN LANDING GEAR RETRACT CYLINDER. OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.