Two of my keys popped out of the keyboard on my Unibody MacBook Pro, and Apple said that they didn't have the parts to fix in stock. Four days later, when I got it, Apple said on the repair sheet that they replaced "Top case with backlit keyboard" and quoted a price of $385. Exactly what part is that? The space bar still has the same wear and tear as it did, and the distinctive marks my unibody enclosure are still there. What did they do that costed so much? I have AppleCare so I didn't have to pay this bill, I'm just curious.