As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER SELECTING LANDING GEAR HANDLE TO DOWN POSITION, THE NLG DOWN AND LOCK ANNUNCIATOR DID NOT ILLUMINATE. FOLLOWED CHECKLIST AND PERFORMED EMER GEAR EXTENSION. LANDING WAS UNEVENTFUL. MAINTENANCE REPLACED THE NLG DOWN LOCK SWITCH. A SUCCESSFUL OPERATIONAL CHECK FLIGHT WAS PERFORMED. AIRCRAFT WAS RETURNED TO SERVICE.