In my A4 (2000) a strip of black fabric is gradually emerging from the dashboard, at the upper edge of the frame around the central air vent. It isn't doing any harm, but it looks ridiculous. I can't pull it out, and I can't push it back in. I suspect I will have to remove the actual vent, but I can't see any obvious way of doing this - I don't want to pull it out by brute force in case I break something. Any advice will be gratefully accepted.