YES, microsoft!
You get 3 red lights you have extended warranty, they cover that for 3 years, repair it for free, ups collect it from you for free.
Don't tamper, as soon as you do microsoft wont touch it.
Enter your code from the back of the xbox and it will most likely say OUT OF WARRANTY they in small writing lower it will say IF 3 RED LIGHTS APPEAR YOU HAVE 3 YEAR WARRANTY...something along them lines, anyway here's the link!
https://service.xbox.com/servicehome.aspx?mkt=en-gb