This sounds like (but is much worse than) a click I had. Mine only manifested when turning to near full lock and only in one direction (I forget which now). I didn't pay much attention to it, but eventually I had it at the service center for something else and they noticed the click and replaced some bushings as part of a service bulletin, which fixed it.
I would definitely have your service center look at it. I'm sure they'll be able to get it fixed right up for you.