Jack Allison wrote:
Looking forward to your findings Bill. Reason being, the Autocontrol
III in our Arrow only works in heading bug mode.

Are you saying it doesn't work in ROLL mode, but does work in HDG mode?
Unusual, but if so then it's a pretty simple fix. The HDG switch
essentially disables the ROLL pot, so if it works okay in HDG but not
in ROLL, then either the switch is bad, or the POT is bad, not much
else involved.