As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH, LANDING GEAR WAS EXTENDED AND RIGHT MAIN LANDING GEAR DID NOT INDICATE A GREEN DOWNLOCK LIGHT. LANDING GEAR WAS RECYCLED TWICE WITH NO CHANGE. REPLACED RIGHT MAIN LANDING GEAR DOWNLOCK SWITCH IAW DC8 MM 32-60-0. OPS CHECK WAS GOOD.