What was found
RT MLG DOWN (GREEN) LIGHT DID NOT ILLUMINATE (ALTERNATE DOWN LIGHTS INDICATED DOWN), RECYCLED GEAR. ALL 3 DOWN LIGHTS CAME ON. REPLACED RIGHT MAIN LANDING GEAR DOWN LOCK SWITCH IAW PARA 3 OF DC9 AMM 32-60-01-2-0101, PARA 1D APPLIED, NO GEAR SWING REQUIRED.