My 99 E320 dash light appears to be going out. Only the info section though where the clock and mileage are shown, the tach and speed dials are all fine. The right and left sides are normal, but the center section where the mileage is displayed is now dimmer than the rest, even though it is still easily readable. I've been told it is lit by fiber optics or LEDs. Anyone know if these can be replaced and how?