As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH FOR LANDING WITH GEAR LOWERED RT MAIN GEAR LIGHT DID NOT ILLUMINATE. CREW CYCLED GEAR SEVERAL TIMES BEFORE GETTING A GEAR DOWN INDICATION, THEY LANDED WITHOUT FURTHER INCIDENT. MX INSPECTED THE RT MLG AND FOUND EXCESSIVE AMOUNT OF DIRT AND LUBE ON DOWN LOCK SWITCH CONTACT AREA. THEY CLEANED OFF CONTACT AREA. OPS CHECK GOOD IAW MM 32-60-0. ACFT WAS RETURNED TO SERVICE.