As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH, UPON GEAR EXTENSION RT MAIN LANDING GEAR GREEN LIGHT FAILED TO ILLUMINATE. CYCLED GEAR UP AND RED, UNSAFE LIGHT STAYED ON. CYCLED GEAR DOWN AND AFTER 20 SECONDS GREEN (SAFE) LIGHTS ILLUMINATED. CLEANED CORROSION FROM RIGHT MAIN LANDING GEAR DOWN LOCK SWITCH AND CANNON PLUG. OPS CHECKED GOOD IAW DC8 MM 32-60.