As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PILOT NOTICED THAT HE WAS NOT GETTING A LANDING DOWN AND LOCKED INDICATION. AFTER DOING A FLYBY THE TOWER CONFIRMED THE GEAR WAS DOWN. THE PLANE LANDED SAFELY, MAINTENANCE FOUND THAT THE RIGHT MAIN LANDING GEAR DOWN LOCK SWITCH HAD FAILED. A NEW SWITCH WAS INSTALLED AND A SATISFACTORY TEST OF THE DOWN AND LOCKED INDICATION SYSTEM WAS PERFORMED. AIRCRAFT WAS RETURNED TO SERVICE.