Everything Mesa offers for support unfortunately doesn't include that schematic. Try calling them. They might have a hard copy you could get them to scan or fax to you. It would be a shame to have a dead mesa piece lying around.
If you get it, please post it somewhere for the rest of us. And be sure to tell the guys at Mesa to put it on their tech support site.
i never thought of that, i think the local mesa tech near me has a few pages of a schematic, he said i might be able to look at it but mesa was real strict about not releasing schematics.