What was found
THE FLIGHT CREW REPORTED THAT DURING APPROACH, THE LANDING GEAR SELECT HANDLE WAS PLACED IN THE DOWN POSITION BUT THE NOSE LANDING GEAR FAILED TO INDICATE THAT IT WAS DOWN & LOCKED AFTER EXTENSION. A MANUAL LANDING GEAR EXTENSION WAS PERFORMED AND THE AIRCRAFT LANDED SAFELY WITHOUT FURTHER INCIDENT. MAINTENANCE TROUBLESHOT THE SYSTEM TO A FAULTED DOWN LOCK SWITCH AND REPLACED THE SWITCH. EXTENSION AND RETRACTION CHECKS WERE SUCCESSFUL AND THE AIRCRAFT HAS BEEN RETURNED TO SERVICE.