Can you be more specific as to what is supposed to be proved with the manual?

Many people would be quite happy to point out prior art if it helps deal with a patent troll (oh for <deity>'s sake, that was totally a solved problem x years ago), but a manual may or may not contain what you're looking for.

... and if it's a 2007 patent, wouldn't a 2000 manual be just fine? Or indeed any empeg bought off eBay?