Short update : my car is at the dealer since this morning. I test drove it with the tech and I was able to recreate the noise. It happened under these conditions :
-I start the car, usually let it run for 2 minutes. With the a/c on.
-I put the driving mode in sports+ with the shifter in sports position. Always in automatic.
-I start accelerating softly until about 2000-3000 rpm then I accelerate harder at 90% of the throttle.
-as soon as the car shifts it makes that squeaking noise.
They had all day and they still didn't figure it out. Soon hopefully
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