I have an STEC 30 autopilot installed in my XLRG. I have been working on other things and flying the airplane without the autopilot connected. I now have it connected and the autopilot has a steady roll oscillation . I have been told that the gain needs to be adjusted by changing the value of the resistor. Has anyone done this? Do I really need to have it done by a S-TEC dealer? Jack N55XL