What was found
WHEN LANDING GEAR WAS RETRACTED, NOSE GEAR ADVISORY LIGHT REMAINED ON. THE GEAR WAS SELECTED DOWN PER THE CHECK LIST; THE MAIN GEAR CAME DOWN AND LOCKED, THE NOSE GEAR INDICATED UNSAFE. THE CREW PERFORMED AN ALTERNATE EXTENSION. INSPECTED WIRING HARNESS FOR GEAR DOOR PROXIMITY SWITCH, FOUND TO BE OKAY. REMOVED AND REPLACED SEQUENCE SOLENOID VALVE, NOSE GEAR ACTUATOR, AND DRAG BRACE ACTUATOR. CYCLED GEAR SEVERAL TIMES IAW DASH 8 MM; OPERATIONAL CHECK IS GOOD. ACFT RETURNED TO SERVICE. ACTC: 18445. (X)