I have a mid-2011 13" MacBook Air purchased in December, 2011 from Apple. The past few days I've noticed this fraying on the tip of the adaptor. The wire is now exposed. I remember this being an issue on older MacBook cables, but hasn't this been resolved? I don't use my cable in any "abnormal" situations. It barely leaves the house. My MBA is covered by Apple Care. Any chance this is covered?