My MacBook has been randomly going to sleep and I finally got around to having Applecare send me a box. I was wondering if any of you had some tips for sending it in. I was planning on wiping the HD and reinstalling OS X so that none of my stuff is on there. I was also going to put a note in there for whoever is going to do the fixing. The only thing they know is that it has "heat-related issues". How about something like a ten-dollar tip?