CJ19844

I have a 2021 GMC Sierra AT4 with 27k on it and it has had the same squeaking noise when decelerating since I purchased it with 7 miles on it. I have had it to the dealership twice. First time they said it was a boot connected to the brake pedal and that they lubed it up. I just agreed and knew that I would be bringing it back. The second they tried stating it was coming from the transmission and did nothing but remove the skid plate and look for debris. I swear the noise is coming from the front of the engine. Not the transmission but I guess I could be wrong. Something needs to be done and GM needs to be held accountable.