A4 cab back seat wet

[lewie]

Noticed yesterday that the back seat (passenger side) was wet- I removed it an dried it thinking I'd left the rear window open slightly bug this morning again there is a small puddle where the seat would be.
as I sat there I noticed if seemed to drip from behind the side panel (where the speaker is).
the car is parked normally facing up hill
any ideas??
ta

 

[lewie]

Saw this thread- seem similar but had no conclusion
http://www.audi-sport.net/vb/a4-a4-.../157751-rear-drain-hoses-a4-b6-cabriolet.html
seems to be when I spray water on the window direct- the drains defo work - could it be a send..?