Update:
Had a brief conversation with Ronald today and he wouldn't divulge any information. He also wouldn't even confirm if the tractor was ever brought in for diagnostics or repairs, so it's up to Duramax to post any findings (he may have an agreement with Ronald not to divulge). I can understand Ronald's position though, however I think things may have gone better if I hadn't introduced myself. Apparently I have a bad rep.
So we may never know.............