Bought my 04 AT G in for a state inspection and the dealer told me that I had a problem with the axle in the rear. It seems that it was a common problem and infiniti sent out a bulletin to all the infiniti dealers about it. I cant describe it in technical terms but the service guy told me it had to do with the axle bar or something rubbing against something esle when I move the car from a stand still. It produces a small squeek as a result. If you hear a distinct squeek coming from your rear... this my be the problem. Repairs are free. Getting my fix in a week or so.

 

Can you post the bulletin number..??? need to get mine checked out too

 

Yap, had that problem.
Here is a link to a post I put in few months ago after my dealer finally identified and fixed the problem.