There are several options for you to do so.
1) You send your Xbox 360 back to Microsoft. They will fix it for you. When you send it back, do not expect to have your Xbox 360 will be repaired in a few days, no. It takes at least 1 month. Not to mention that this is the price of $ 140, - You might think that this is the best option because Microsoft will know how to fix it. But do not forget that they are the ones who messed up.
2) If you want the Xbox 360 e74 fix, you can send it to service. It can be uzetipar days, but the costs can be high. This is because you have to pay repair costs, hours of work they put into it, etc. It can cost you around $ 100, - not really cheap for a small problem ...
3) The third and best option you have is to fix e74 error by yourself. Fix Xbox 360 e74 really does not take much time. In fact, it may take you less than an hour! And the cost will be very close to $ 0, -. Now I do not think it can not do, because that is nonsense. Anyone can do it, as long as you have a guide on your side.
