Sounds to me like the sunroof drains need unblocking. In each corner of the sunroof with the glass rolled back you will see a drain hole which guides water down the A-pillars and exits near the front door hinges.
Blow an air line down there or alternatively some pipe cleaner to clear the lines and all the cr@p will come out onto the ground. Pour a certain amount of water down it after and see that the same amount comes out.
Not an A8, but the same thing applies... Watch this video:
https://www.youtube.com/watch?v=ymZNgKkEdXk
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Currently '8-less
Previously:
- Aqua Blue Pearl D3 S8 - Kamut Beige leather, ACC, B&O, factory RSE, solar sunroof, electric blinds, ski bag, Homelink, comfort headrests.
- Aqua Blue D2 S8 - Grey leather/Alcantara
- D3 A8 3.0 CVT
- D3 3.7 V8
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