does the replacement trigger a new warranty period?
one thing I discovered after 3 replacements of my Surface Pro 3 was that the warranty period didn't get reset each time... because I was getting refurb machines they would only honor the original period as 'new', and the last replacement (just inside the original period) only got 90 days of coverage. It, of course, died on about day 120 and now I use a Macbook