[xeroinfinity]

I doubt the servo unit is the cause here.

If you keep pushing/messing with the "set" button sometimes it will work. My GT is often like this, and sometimes it wont set at all until I shut off the car.
My Cruise light on my dash doesnt work either, which thats probly a bulb failure.

If you cant get it to work then, maybe you can get it checked out. The unit is on the pass side engine bay.