As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON GEAR EXTENSION, DID NOT GET LEFT MAIN GEAR (GREEN) LIGHT. RED GEAR UNSAFE LIGHT DID NOT ILLUMINATE. RECYCLED GEAR AND ACCOMPLISHED TOWER FLY-BY. LANDING WAS UNEVENTFUL. COULD NOT DUPLICATE DISCREPANCY. INSPECTED WIRING AND REPLACED MAIN GEAR DOWN SWITCH AS PRECAUTIONARY. SYSTEM OPS CHECKED GOOD IAW DC8 MM.