hello everyone,im just putting this up as it may interest some people.i got the tb and wp done over a year ago on my 2016 a6 2.0 avant ultra,i sold it to my daughter {very cheaply!}about 9 months ago and last weekend she was hearing an odd noise,i checked it and could find nothing wrong so she brought it to a local mechanic whos very good with german cars{he wasnt the man who replaced the timing belt last year} he removed the tb cover to discover a small bolt had come off one of the pulleys and was flying around inside the casing,it damaged the belt badly and hes now replacing it,we were lucky it didnt get stuck between the belt and the pulley,anyway suffice to say i wont be using the original mechanic again,ive attached photos of the belt and the little bolt.Greg