I have the same problem. At the beginning the noise was very low and acceptable, but with a addition of about 1 000 m on the speedo, the noise became harder at very low speed and when we used the steering without moving, it looks like the problem is coming from the suspension.

A friend of mine who is a mechanik guy looks at the suspension and all the components of the direction. Nothing about some loose parts. But when we looked at the steering box we heard noise inside of it when we turn the steering. The car is now at the dealer ant I hope they will find the trouble. I give you all the informations I will try to get from the dealer, ... if he wants!

My wife car has 7 000 miles for a 2007.