Hi Ron,
If the AP is 'self inducing' it's own errors (i.e. it starts climbing and adds more up travel) or banks and adds more bank input, then the servo direction is reversed. If you used one of our harnesses you clip the yellow loop wire coming out of the connector to reverse the direction. If you rolled your own, then you have to probably change 2 wires to reverse the direction. You have a 50% chance of getting it right the 1st time, so this can be quite common. There is an easy test in the hangar. Turn on the AP (engage the servos), then go back and either lift or push the entire airplane tail up or down. The elevator should move in a direction to stop what you are doing to the plane (lift the tail of the plane up and the elevator should move up). For roll, simply engage the AP, then turn the heading knob and see if the AP is moving the ailerons in the right direction appropriate to the turn you induced.
If that is all working correctly on the ground and in the air, then it could be something else. In that case you better call one of the techies at TruTrak and see if you can trade a servo or controller (depending on their recommendation).
Hope that helps!
Cheers,
Stein.