I actually found my first broken part on my Mission today. I say 'found', because I never would have known if I hadn't been taking the car apart to clean the bearing.
When I took one of my wheel hex's off, I found that I had actually broken the axle pin that engages the hex. I don't even know when it happened. Anyway, I guess that isn't bad for my first broken part on a Schumacher sedan since my original SST2000!