As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH INTO PIT, THE RIGHT MAIN LANDING GEAR GREEN LIGHT FAILED TO ILLUMINATE AFTER GEAR WAS EXTENDED. RECYCLED GEAR AND NORMAL INDICATIONS WERE ACHIEVED. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE RIGHT MAIN GEAR DOWNLOCK SWITCH RECEPTACLE CONTAMINATED WITH DIRT. REPLACED SWITCH, OPERATIONAL CHECK NORMAL.