You may be having a problem that recently began to vex me. I suddenly could not get to the drawings! But I see now it is one of those big "improvements" the computer folks add without letting us know.
On my PC, I now get a notice that the Winnebago drawings are unsafe and it refuses to go there until I click on a small shield up in the top right corner and then I have to tell it I want to go there anyway and it let's me.
Meanwhile, this link mya/may not help you get there?
This is the link to the drawing which shows physical layout of things for help in finding them on the RV: