Hi i made a post about my audi concert system sometime ago. I had an issue with the Volume Button (USUAL COMMON FAULT). I took it to a Local company to get it repaired and he said it can't be repaired but they had one on the shelf i could have for £50 + my old head unit. I'm quite tempted but i'm worried that the same problem will accur with the replacement unit. Does the Volume fault happen with ALL Concert Head units or only a select few?? Cheers Jimmy.