I have a 2009 525 IRS with only half a season of riding time on it. While I was adjusting the chain I noticed that when I grab the sproket with one hand and the brake disk with the other I can feel some play in what I belive would be called the carrier bearing. It's not alot but I dont think there should be any play there. Anyone else had these bearings fail so soon? Much of a job to change them?