What was found
DURING DESCENT, WHEN GEAR WAS LOWERED HAD NO GREEN LIGHTS ON THE LEFT MAIN LANDING GEAR. AIRCRAFT PERFORMED A GO- AROUND, CYCLED GEAR AND INDICATIONS WERE NORMAL. CLEANED CORROSION FROM LEFT GEAR DOWNLOCK SWITCH WIRING TERMINAL STRIP. REPLACED LEFT GEAR DOWNLOCK SWITCH IAW DC-8 MM, OPS CHECKED NORMAL.