What was found
DURING APPROACH INTO DTW, THE LEFT MAIN LANDING GEAR UNSAFE LIGHT REMAINED ON AFTER GEAR EXTENSION. FLIGHT CREW DECLARED AN EMERGENCY AND ALTERNATE GEAR EXTENSION PROCEDURES WERE UTILIZED FOR LANDING. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED GREEN DOWNLOCK LIGHT BULBS AND PROXIMITY CONTROL BOX. ALSO, REPAIRED LEFT AND RIGHT MAIN GEAR DOORS DUE TO DAMAGE INCURRED ON LANDING. OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.