Your not likely to find anything official I wouldn't think. For obvious legal and liability reasons they probably don't want you fiddling with the installed gear.
In my old Springdale I had to do things the hard way. I used one AC breaker or DC fuse at a time to map out the equipment run from them. Then used non-contact voltage detectors and a flashlight to trace the wiring. Took hours to map everything and discover a good portion of it was inaccessible.
But if you've got a few basic tools, some paper, and a bunch of patience...