What's the problem? I might be able to help you fix it. I've repaired several Xboxes just recently.
If I don't play a game in a long time my Xbox can't play it, so I have to play a game regularly to keep it working (which is the reason I can only play SWBI/II on my Xbox), and in order to play it I had to rent it from Movie Gallery, and I finnaly cracked and got my own copy to keep but it's been a year or so since I've played it (since our MG closed) and my Xbox won't recognise it.
Also it's not a 360 so if you repair Xbox with 360 implied then what you suggest might not work.