I have a 2013 A8L (D4) 4.0t. Have owned this for several years. Just this past summer I had an issue where the sunroof would not close. Did a soft reset per instructions and it is working fine, however after this I noticed a lot of water has accumulated in the right trunk well. I have since cleaned and dried everything up. Thankfully it did not go over the lip which would have caused catastrophic electrical issues. I was able to clean the front drains, in fact they were not clogged at all. I cannot find the rear drain holes to make sure those are clean. Are they in the same spot as the D3? if not does anyone have knowledge where these are? I have also read that the rear window seal can be an issue. It is currently raining and I have the car parked at a slight angle facing down hill so the trunk is at the highest elevation. I just checked and there is water accumulating in the right trunk well. If any of you have had this issue please help. Thank you