Would like help with a vacuum diagram please! Olds Bravada
 

My daily is a 2001 Olds Bravada.
The AWD system is dead, and the truck is defaulting to RWD only. Was wondering if anyone could lend a hand and pull up a vacuum diagram, or happen to know of any common problems with this truck's AWD system.
I know the transfer case actuators are really common in larger trucks, but I believe it's a different system for this mini-POS.

Thanks in advance for any help!