I have an 09 Macbook with a custom installed glass screen aka: those from the 13" MBP's. This installation was done via a certified apple retailer under applecare, so my machine is still under warranty. I have now had a chance to check out the back in time to see not only some pretty horrific discolouration by the fan's in the back of the machine, but I also see some hairline cracks. They're so small atm I can't get anything much smaller than a pair of tweezers to catch on the crack, but they're definitely cracks and not lines. My question is, is this a usual problem, and can this be covered under applecare for free?