The inside and the potentiometers have been cleaned. Lights have been upgraded to LEDs. It works great, with no scratchy noise. The LED on the far right does not always work. The bulb is not the problem, there must be a connection inside that has an issue. That being said, the other LEDs make the whole dial visible. The balance knob does not work. Some of the knobs have scratches or damage. There is some writing on the back of the unit.