I just bought on older Syncrowave 250 (serial KC, 1992 I believe) and wondering if Miller or someone has a technical or diagnostic manual. I downloaded the owners manual from the Miller website and there is some good information there but I am looking for more. I saw another post refer to a "technical manual" with scope traces, pcb schematics, etc. but unable to find anything about it. Also, who are good parts sources for Miller?