email them... lol my warranty was up and they did it for free, for the 2nd time too...
I bought my 360 back in June 2007 off of ebay. Worked great till bout thanksgiving when the bitch fucked up on me and got the RROD... emailed microsoft, got my box, sent it in, got a refurb'd one... bout 3-3-1/2 weeks later I got my xbox and was ready by xmas.... then it fucked up again during the summer. But I then I sent it in again, got it fixed...and they gave me a BRAND new xbox. Like I got it in June of 08, and the 360's manufacturing date was from May 2008. Since then its been fine, though I got a NYKO intercooler thing from my friend when I stayed by his house the day of the super bowl cause we went and saw Slipknot two nights before and we chilled over the weekend...and I used it and it gave me the RROD once. To this day since that day, I havent used the intercooler ONCE and my xbox is still 100% perfectly fine.
Dude I suggest you email them and ask them to see if they can fix it