Awhile back, my friend got an Xbox 360 from a friend, only to have it get RROD a few days later. I fixed it temporarily, but it just went back to the RROD state a few weeks later. This lead me to believe that I'd never be able to fix it permanently, so we sold it on eBay and started saving up for a new Xbox.
3 weeks ago we finally put together enough money, buying him a refurbished Xbox from Gamestop. He'd been playing it perfectly up until today, when he started getting black vertical lines on his screen. It later turned into error E74. Since the Xbox is flashed, it voids the warranty, not allowing me to take it back to Gamestop. This really makes me angry that a refurbished Xbox from Gamestop would crap out on him that fast, and I really want this fixed.
Now for my question: are there any services in the United States that would permanently fix error E74? I don't want to do any of these cheap, temporary fixes anymore. He deserves to have a fully working Xbox, and it's just terrible that he's been screwed over by Microsoft 2 times in a row. It needs to be some place that's reliable and will get the job done right and make sure that it'll never happen again.
Thanks in advance!