On my 2005 MCS with barely 900 miles a strange noise is developing between 2 and 4000 rpm on second and third gear.

I don't even know how to describe but it seems that is making its presence only when the engine is fully warmed and I was driving for a while. It almost sounds like a slipping clutch but not that loud.

I am planning on making an appointment tomorrow but wanted to see if anybody lese experienced this.

TIA