1988 Other Oldsmobile Models exterior lights

My 1988 delta 88 royasl brougham has opera lights on the door posts I can trace the wire into a large harness going towards the front of the car and lose it inthe harness, as the opra lights are not lighting up I am assuming it is a burnt out bulb and this is the fiber optic cable (same as the light around the keyhole ) Question -where is the bulb located manual does not even id the opera lights, I have looked many places but cannot find it (both sides of cars lights are out)