Welcome to the forum.
I think I may ask a moderator to move this to the Winnebago Owner's Forum section of iRV2 as somebody who is more familiar with your specific coach may be able to tell you quickly where to check.
I was wondering what you meant by "power windows" but I now am thinking that you have a driver's door, correct? Is the window on the passenger side also powered? Have both mirrors lost the ability to be adjusted manually?
If it's just one side, you might check to see if a wire has come loose that maybe transverses the door hinge? before you can find out where all the fuse panels are located or the panel you'll need to check.
Winnebago is great about providing wiring diagrams as you probably know. Here's the wiring book for your coach in case you don't already have it:
2006 Voyage/Sunrise 35A Wiring Diagram Book
Also, don't forget that there is a spin-off forum from iRV2 and is also in the "RVLife" group of forums and is devoted to Winnebagos and can sometimes be a resource too in addition to this forum ...go HERE