As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, GEAR SELECTED DOWN, THE LT MAIN LANDING GEAR DOWN AND LOCK LIGHT FAILED TO ILLUMINATE FOLLOWED BY THE GEAR AURAL WARNING HORN. THE INDICATOR LIGHT TEST WAS GOOD. THE FLIGHT CREW FOLLOWED THE EMERGENCY CHECKLIST AND UTILIZED THE EMERGENCY BOTTLE TO BLOW DOWN THE GEAR. THE FLIGHT CREW DIVERTED AND DECLARED AN EMERGENCY. THE AIRCRAFT LANDING WAS UNEVENTFUL. MAINTENANCE TROUBLESHOT THE PROBLEM TO A BAD LT MAIN LANDING GEAR ACTUATOR SWITCH. THE ACTUATOR WAS REPLACED AND FUNCTIONAL CHECK WAS GOOD.