What was found
AFTER LANDING GEAR EXTENSION, THE LANDING GEAR DOOR OPEN LIGHT REMAINED ILLUMINATED. THE FLIGHT CREW FOLLOWED COM PROCEDURES, RECYCLED THE LANDING GEAR SYSTEM, AND LANDED AT DTW WITHOUT INCIDENT. MAINTENANCE ADJUSTED THE LEFT LANDING GEAR DOOR LOCK ROLLER ASSEMBLY AND REPLACED THE LEFT AND RIGHT LANDING GEAR DOOR SKIDS. OPERATIONAL CHECK NORMAL.