The autofocus was getting a little sluggish, and it has the dreaded squeak. It is less than a year old, so it's covered by the warranty. Hopefully it won't take too long to get it back....I miss it already.
David, I sent mine in also, wasn't under warranty, cost just over $200 I think. They cleaned everything and replaced the motor. It works awesome again! Turn around time was less than three weeks, but I sent it to them overnight with a note. I would call them after they get it and ask them to rush it.