I have searched to no avail, and yes I've read the gigantic transmission adjusting thread that contains links to all sorts of things... I've checked the sites and they stop at '85.

Unless i've missed something in which case I apologize.
Where do I look for good vacuum diagrams... not just for the transmission systems but, well, basically anything I can get my hands on that pertains to the car - for my 86 300SDL with a 603? (duh... just clarifying)
We've got all sorts of random things to figure out (need to troubleshoot transmission that shifts like a rodeo bull, need to figure out why dash vents only provide air to the windshield, need to figure out where a couple of vacuum lines are actually supposed to go, need to figure out what a few mysterous devices under the hood are (and if we could do without them...)... basically, I need diagrams for the vacuum system on the whole car. Or any parts of it.
All I can find through my searches are for the pre-86 models...
If I've missed a grotesquely obvious place, then I apologize again.
Anybody help? Thanks...