I finally got my 2012 out of storage today. I took her for a short 25 mile ride and when I stopped I had oil on my rear rim. The bike has been stored in a heated building since last Oct and only has a little over 6K on it any suggestions? My wife thought she heard a growl from the rear of the bike once, but could not hear it again. Please tell me it can't be the rear dif. and how would I check that.