Use Microsoft Xbox website. I got the three red lights pre-Xmas. Had the xbox collected by UPS on Xmas eve, back by first week of Jan. Microsoft had exchanged and reconditionned the unit - FOR FREE. What makes this really pleasing is that I had bought the Xbox off ebay about 18months ago and did not have a receipt. Microsoft get a lot of bad press, but on this issue, well done.
TRL of Death, January 2009