If you're talking about the cracked palmrest then Apple should fix it again. Not only is it a manufacturing flaw, but the palmrest/case they replace was warrantied for a year starting when they replaced it, not on the age of the machine.
I have the exact same problem and it has done it before too. Im going to ring Apple tomorrow as its late here, but from what im reading on the Internet they should fix it for free as it is a manufacturing defect to do with the magnets in the lid.
**And reading the terms and conditions on the back of my previous repair, Apple only cover defects on replacement parts for 90 days.**
If you're talking about the cracked palmrest then Apple should fix it again. Not only is it a manufacturing flaw, but the palmrest/case they replace was warrantied for a year starting when they replaced it, not on the age of the machine.