Sam Lionheart, I agree with you. Sadly, I highly suspect the reason for the repair costs being as high as they are is because Apple won't even try to repair your old unit if it breaks. They'll just throw it in the bin and ship you a new one.
When sliding the logic board back in, also be careful and make sure the rubber “sock” on the logic board wraps around the AC-in socket on the power supply.
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