What was found
EN ROUTE BIS-MSP, MAIN LANDING GEAR DOOR OPEN LIGHT ILLUMINATED. FLIGHT CONTINUED TO DESTINATION AND EMERGENCY GEAR EXTENSION PROCEDURES WERE UTILIZED FOR LANDING. AIRCRAFT LANDED WITHOUT INCIDENT. REPLACED THE LEFT MAIN GEAR SEQUENCING PUSH/PULL CABLE. ALSO, REPLACED TORQUE TUBE LOWER BEARINGS, DOOR SKIDS, AND INSTALLED DOUBLERS ON BOTH DOORS. OPERATIONAL CHECK OK ON GEAR SWING. AIRCRAFT RETURNED TO SERVICE.