Car is a new A3 sportback 2.0 TFSI with 2,500 miles on the clock. Over the last 2/300miles it has developed a noise at tickover in the vicinity of the pulleys. It's hard to describe - like a dullish resonance. It's not there when the car is cold only when warm. Car has been back to Dealer who didn't dispute that there was a noise. Comment was "that's unusual, never heard that one before" . They stripped of the belts and covers and examined everything but could not find any faults. Anyway they said to drive it for a bit longer and see if it develops!! (At least they know if anything major happens) Are there any known "high incidence" causes of unusual noise eminating from the region of the pulleys? I've not owned an Audi before so haven't built up a lot of background knowledge yet.