I am having an issue with my auto climate control in my EF. the circuit I am referring too is the denso box found under the center console just above the carpet next to the firewall and opens/closes the water valve.

I have tested my broken auto air con and the one I put in to replace it when I broke it and neither temperature adjuster makes the denso unit turn. The unit itself will turn when I manually drop the gear w/ copper on it. It will sometimes turn one direction then back the other.

I doubt its the temperature adjuster because the odds of both units being broken seem low.

The denso unit does get power and does turn.
The temperature adjuster also gets power (at least the light does)

Which leaves me to 2 possibilities.

1. The wiring might be cut (highly unlikely because I would think the wiring wrapped up in would also be having issues.

2. The denso unit itself if messed up.

What type of place would be able to fix/replace this circuit board? Its for a car but I am not sure what kind of auto shop would do this. Maybe some sort of computer place?