Mine has the same thing. The whole thing kind of snapped off with a loose end facing the trackpad. I used some tape to keep it in place so it looks pretty ghetto. On top of that I have major discoloration issues. It's really annoying, but I can live with it for a short time. The closest Apple store to me is 3 provinces over in Toronto, and the closest service provider is about 4 hours away. I won't be able to get anything fixed until the second week of May when I move. It's aggrevating because I would like my Mac to stay in pristine condition, yet I'm not hating on Apple for anything. Either way, since I bought my Mac back in June of last year, would they still replace the top casing for discoloration if the crack is there? Would they do anything even though I've had these issues for a while and won't be doing anything until close to the year mark?