I have experienced problems with the control unit of my Raymarine 4000 auto pilot which is installed on my 1998 B352 . All the control buttons work consistently with the exception of the "AUTO" button. I often need to press the button a number of times to get it to engage the system. I understand that Raymarine does not support the 4000 any longer and replacement system would cost approximately $2,000. That's a lot of cash to fix one button! Any ideas out there?Murray