I have noticed a creaking when you jack up one side of the car - it comes from the back suspension and may be the same sound. I also get this sound from my '02
MCS which as an aftermarket thicker sway bar - the sound comes when the bushings need greasing. I have not worried about the sound from my 07 because it only happens in extreme situations when one side is lifted much higher than the other. I would ask your dealer if it happens in normal driving.