I have a mid-2009 17" MacBook pro and it has the "t style" adapter. It is currently showing no signs of fraying. I called apple and they said they would be able to replace it for free, they would just put a hold on my card for the amount it'd cost to replace it and then the hold would be taken off once they receive my old charger. My question is - if I send my power adapter back with no signs of fraying, do you think they will charge me? I don't want to wait until my adapter actually frays because my luck, by then they won't be offereing to replace them for free anymore. Advice?