I did finally get a hold of diagrams, and for the good of all Mitsubishi Endeavor owners all around the world or just the US, I'm posting them to this forum. I hope some other owner finds this information valuable.
A BestBuy install guy went against store policies and printed up the wiring chart for me from DEI database. The charts also have a disclaimer at the bottom that the information is provided free of charge and on as-is basis. So I feel OK about posting it, so don't complain.
I haven't ripped into my wife's Endeavor yet, but DEI is pretty reputable so I have confidence that much of the wiring will be fairly accurate. Maybe I'll followup again and post my results.
Check the attachment. For those of you out trolling, you'll probably have to become a member to view it.