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Dale: I had the same problem for years and years with my 400 series autopilot (not cold weather, but intermittent HARD wingover). Passengers LOVED it! (just kidding).
I would have another odd problem. Cold start on the ramp, it would run the aileron servo hard left. I'd resist it (get George in a head lock) until it just sighed and let go. Then I'd fly and it would work most of the time, till it didn't.
Eventually I got sick of putting money into it and got an S-Tec 55. If you are going to keep the plane, I recommend biting the bullet and getting rid of the old autopilot. Once it gets to the point that you are having that kind of problem, its not worth the aggravation.
Regards,
mike zinn
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