How do i send in my xbox 360 for repairs because of "E74 Error"?

Question by CholoRedux: How do i send in my xbox 360 for repairs because of "E74 Error"?
first i need to know exactly how to send in my xbox 360 for them to repair, and also i need to know how much it will cost.

also how do i get a box from xbox support so i can send mine in?

this is

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