What was found
CLE - FLT 1718 - MAIN LANDING GEAR DOORS WOULD NOT RETRACT AFTER GEAR EXTENDED FOR LANDING AT CLE. THE LANDING GEAR DOOR OPEN LIGHT ILLUMINATED AND CREW CONFIRMED THE DOORS WERE DOWN BY A VISUAL CHECK THROUGH THE VIEW PORTS. 'ABNORMAL' PROCEDURES WERE FOLLOWED AND THE AIRCRAFT LANDED WITH GEAR DOORS DOWN. MAINTENANCE FOUND LT MLG DOOR DAMAGED. THE LT MLG DOOR WAS REMOVED AND REPLACED. BOTH MLG DOOR PROXIMITY SENSORS WERE REMOVED AND REPLACED. GEAR INDICATIONS AND OPERATION CHECKED GOOD. (X)