Hi again . In the trunk drivers side under covering is what I think is an amplifier . Has 2 connectors . One is electrical . Other is fiber optic . I can see a red glow from it . There are 2 connectors into rear of radio . Again one is electrical while other is fiber optic. Again I can see red glow . I popped by a car audio shop . They told me that indeed it probably is fiber optic . They also told me that they would not work on it as set up is too complicated. I have decided not to bother pursuing repairing the radio . The CD player works just fine and is good enough .