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Swapted out U9 and still same problem...Any other problems, possibly with wiring harness loosing a ground? Since I haven't moved anything I find that difficult to believe, but I've seen stranger things.

Check diodes and they all checked good. I'm suspecting U9 now... Is there a way to test U9 other than just replacing it?

Thanks Mark, as soon as I get back in town (this weekend) I'll take a look. So if any of those switching diodes shorted, it is essentially seeing a stuck switch, correct? Wouldn't that also give me some points or is it that it never opens back up so it doesn't see it as a stroke of a switch? James

Everything was working fine then started resetting itself intermittently, then stopped altogether. Checked fuses and the power supply and found 12 volt power was well over 12. Replaced 12 volt regulator and capacitors and now appear to have correct voltage. Machine turns on, boots up and goes...