Focus ST.. Quit with cold engine possibly from the turbo?!.! Please for help!

Hello! I’ve been getting a new Focus ST since a few weeks..! He has now about 1800km down and I was already at the oil change so that I can really give gas as well prescribed!!! But now I have a problem that he squeaks when starting the engine when it’s cold!!! If I have pulled the car up 2-3 times that’s already gone again..! Nervt only that when it’s cold and I start him then he squeaks and sounds stupid..! my workshop m I agreed that this comes from the turbo but they don’t know what it is and that it will eventually go away again! Maybe another one has the problems and can help me?! Thanks in the vorrus!