SW,

I know you had a bad 70-200, did you send it in with the MKII N?

An FYI for everyone - If for some reason you have to send gear in to Canon, especially for AF work it is best to also send in the lens(es) you normally use on that body and have Canon adjust them for your shooting style or the conditions you shoot in. Most Canon lenses are set at the factory to work best (ie: sharpest) at f8 or f16 depending on the lens. However if you shoot a lot of low light/indoors stuff they can adjust the body & lens to work better together and get better results. You have to ask them to do it though or they won't. It doesn't cost a lot, maybe around $100.

JS