Yesterday the GP1.5 was given a short exit. In the stand and during a leisurely journey until almost 2000 U no unusual. If you give gas then the really shrill, high sound frequency whistles. Thought already there slipped a wedge belt or would be a camp firmly over which a belt then slips. Or turbo ? I have no experience at all. Can one of you professionals do something with it? Would I be happy if I got your support. Greeting, Eridanus