I'm preparing to sell my G5 tower and I'd like to verify when I bought it and how much longer I have AppleCare for. Unfortunately I misplaced the receipt. I seem to recall there was a section of the Apple website where you can enter a serial number and get the AppleCare info for that particular machine. I went to the AppleCare area of Apple's website, though, and can't find it. How can I do this?