MacBook plastic case cracking

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I have the plastic body MacBook which is about 2 years old. I have noticed that on the top near the hinge 2 symmetrical cracks have appeared on either side of the case. Each about 3 cm long.
Anyone else had a similar problem ? Will apple repair this as it appears to be a design fault and I know it has not been dropped.

 

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i have read a fair bit on the net about this now. it seems that the case will crack again. this is why they stopped selling the unibody macs. a few people have said that they have repaired the case 3-4 times and then requested a refund or a different model.

can this be true? will apple just replace the whole thing?

 

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i am taking it in tomorrow..i will see what they say.