CruisAir 3-knob controls

[Meekstaylor]

Good afternoon! In our ‘83 PT40, the control knobs for our center AC get hot to the touch when that AC is turned on. We’ve stopped using it until we find the problem. New control knob panel from Dometic Marine is $910, so we want to avoid that option if possible. Does anyone have an idea why the controls get hot, and what a good fix would be? We’re not even sure the controls are the problem. Thanks for any help offered!