When I got my A8, the headlight alignment was way off, lights pointing too far down. Took headlights apart (quite easy to do as lens is clipped on) and inside at the back of the headlight reflectors themselves I found a tab that was supposed to be glued on the side, hanging off, if I remember this was the tab that attaches to the adjuster motor. I also found another broke part which I managed to glue back together, this was one of the manual adjusters. This might not be your particular problem but worth a look if your going in that far
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