I have a 2010 as well, with 39k miles on it. I still have yet to receive a MM on anything other than the standard B1 - change oil, rotate tires, inspect everything. The service manager also suggested a Rear Diff fluid change, the last time I was in. I told him maybe next time. Well the MM just went off again 15% life left at 8k+ miles or so since last change, and I still only get a B1 on the MM. So I am debating whether or not to get the rear diff fluid done or not.
2010 CT Ex-L 4WD, w/o Navi, Polished Metal-Metalic, Black interior. Build Date: 11/09
~Ex Nihilo Nihil Fit~