I recently completely repaired my 2010 Q7 TDI that suffered from similar parasitic draw symptoms. The car ran great the 1st month that I had it. I was cleaning the car and had the doors open for an extended time.... Dead battery. I had just bought the Q7 as the 2nd owner from the Dieselgate buy back and thought that the battery should probably be changed before winter came anyways. New battery installed and programmed. A couple of days later... Dead battery in our heated garage. Looong story short I figured out it was indeed draw from the Bose amplifier. To be sure it was the amplifier I tested the fuses with a multimeter and then exposed the amplifier to find it hot to the touch. But, in order to make a complete fix one would have to find out why the Bose amplifier was maintaining a draw. It comes from the poorly engineered panoramic sunroof weep pole connections. As a very small amount of water clings to the outside of the drain hose then drips directly on the amplifier. I preceded by removing the entire headliner and repairing each of the weep holes. On to the amplifier, instead of spending the $400-$1000 for a new or used amplifier--- I opted to go on eBay and buy a new circuit board for the amplifier ($200). Once I replaced the circuit board and installed the amplifier the vehicle had to be taken back to an Audi dealer to be reprogrammed. After that all is working well! I will attach YouTube videos that I found helpful and a picture of how I repaired the weep hole connections.
Video on how to repair weep hole connectors.
Video on how to remove headliner.
Video on how to remove the Bose amplifier.