I had the three rings on my X-Box about a year ago.  I went to Microsoft's website, filled out a ticket, and they mailed me a box with postage pre-paid.  Didn't cost me a dime to send the system back to them in the box, and they shipped it back to me (also free of charge) within a couple of weeks.  As much as I dislike Microsoft, I had absolutely no complaints about this one; the customer support was fantastic, free, and prompt.