After a few trouble free months of ownership, my fiance's Macbook has a bad motherboard and won't charge the system's battery. In recent months, we've sent it back for service twice: once to change the topcase (stains), and the other was to replace the fried motherboard board, which crapped out no more than a week after we got the new topcase installed. This will be the 3rd repair that has been made on this Macbook, which leads me to my question: At what stage will we be entitled to a replacement? AFIAK there is a computer lemon law in california, but I can't find any specifics, and I'm not sure what Applecare's policy is on a repeated repairs of this nature. If anyone can shed some light on this subject, I would really appreciate it. Thanks.