Problem with assembly A8 4.2 Bj.94

Hello, I'm just about to rebuild my A8 after a fire damage, and I have exactly three problems that I don't know: 1. where is the hose attached to the differential DN8 fixed to the other side, or is it just a vent?? 2. A hose with DN6 sits next to the round switch on the throttle flap, where is it attached to the other end?? 3. The wire harness at the front of the passenger side is also defective, because it has a new used one, which is to cut, you can use the el. This is the most common example of the use of the word "e.g. brown cable no matter how you put it together, just mass?? Thank you for your help
LG Patrick