Looking for some help with my M3LR regarding infuriating high pitched squeal

For about a year I have had this intermittent squealing/whistle/high pitched whistling sound coming from the front left of the car while driving. First noticed it after control arms were replaced under warranty. It will go in and out and seems most pronounced on deceleration. I’ve seen other owners have the same complaint but I’ve been to the SC multiple times and despite hearing the sound, recording it and going on multiple drives with a tech, they all claim to not hear it. Has anyone had experience with this or have any clue what it is? It’s driving me insane and making the car a misery to be in every day to the point where I can’t stand it any longer. Someone save me!