The edges of my MacBook are beginning to crack in two spots, the first and most severe is in the spot where the lid-spacer hits on the wrist pad when the lid is closed, the plastic is actually cracked almost right to the edge and is on the verge of chipping off, and the other spot is on the side of the case, I can see a crack starting to form but it isn't too serious yet. Are these cracks/chips covered under warranty? They did not come from abuse or accident of any kind, simply from standard use. The 1st crack on the wrist pad is right where my wrist rests and is starting to get extremely annoying. I got my MacBook in November 07 (It's the SR model) Thanks.