That must suck. The DLC isn't a limited offer so it'll still be there when you get your 360 repaired. Microsoft do it for free, don't they?
Found a video of the interview I mentioned a while back. I put it as a spoiler so it wont load up unless you guys want to watch it. I've already filled the page with screenshots and stuff and I don't want to make the page load any slower than it must for some people by now. It does contain spoilers for the end of the game, though.