S1G autopilot controller

[bigwavedave]

Hi All, have an AP system that includes a E12115 autopilot controller, it was installed /commissioned late 2004, seems like yesterday, but it's never been exactly right. Biggest malfunction is that you would be running w AP engaged and boat would start turning, right most of the time, sometimes to left. Redid dealer setup and seatrial, no improvement. Replaced fluxgate compass with a used part last year, just to see if it helped, it didn't. Just lately it doesn't even want to boot up, without flipping power off and on numerous times. Figured out that it has V3 software and should have V11, isn't that correct? Can't imagine what that would have to do with present problem but thought I should explore doing upgrade first. Understand that upgrade is a repair center procedure, is it still available? Also read thread about removing gyro and redoing setup and seatrial to see if gyro's bad. Will try that, if you think it will help. Hate to just throw it away, Thanks for your help,