As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT MAIN LANDING GEAR GREEN LIGHT REMAINED ON AFTER GEAR RETRACTION. CREW RECYCLED GEAR AND RED NOSE GEAR UNSAFE LIGHT REMAINED ON. FLIGHT WAS RETURNED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED LENS LIGHT ASSEMBLY FOR LEFT MAIN GEAR GREEN LIGHT. ALSO, REPLACED NOSE LANDNG GEAR RETRACT ACTUATOR, OPERATIONAL CHECK NORMAL.