just returned my s55amg from dealership who could not find anything wrong, and l am hearing a squeaking noise on acceleration coming from the rear area,it almost seems like the transmission is slipping and then engages and squeaks before taking off,the company said this was normal and is coming from the supercharger clutch activator?but this seems unusual and is a bit annoying,has anyone had the same experience and is it fixable?it seems that all amgs would do the same!!thanks for any help.