I sent mine in back in July. It came back and wasn't totally fixed. I contacted Nikon again after I did enough testing to completely document the problem. They asked me to provide sample photos which I did. Then the info was sent to Japan and several weeks later they asked me to return the camera. I was out of town at that point, so I finally sent it in last Wednesday.
My status is B2 (major parts) and it says "In shop" right now. I'll probably have it back in a few days and I'll let you know what the verdict is.