I really don't know.... but i do know this week they replaced
the wheel bearings, the control arms, sway bar bushing front,
lubed the rear sway bar bushings with some special grease???
He (the head mechanic) did say EVERYTHING under, in, around the front end has been replaced, tighten, torqued, lubed to specs except the spindles and calipers....
my guess would been the controls arms/bushings....
I don't think they even know..... Happy Trails...

 

Excellent news!!
Enjoy your new car.

 

Thanks, Cheers!!!

 

I have the same thing going on with my 07GTCS except it stops after braking and its definitely in the rear. Hoping I don't run into the same issues as you had to go through and a simple set of brakes pads will remedy the noise.