I have a 2005 aUDI A4 3.0 cab and i have noticed over a long period of time a noise coming from the front belt.
I went to have it replaced today but the garage said they didnt have the right tensioner or something so couldnt do the job but he did state he thinks it sounds more of a bearings noise than the belt.
i have done a short video so you can hear the noise -
Audi a4 bearing noise - YouTube
before i take this to a main dealer and get royally shafted any help would be good as i have done some searching and this does seem a common question however the answers are always different.