The new forums will be named Coin Return (based on the most recent vote)! You can check on the status and timeline of the transition to the new forums here.
The Guiding Principles and New Rules document is now in effect.
If you have anything that can prove you won it from the contest on a specified date, there may be a warranty involved that can replace it. I'm guessing it'd only be a 30-day warranty. Check any papers that came in the box and see if they talk about a manufacturer warranty. If not, at least the guitar controllers are cheaper than, say, the whole game you won.
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PSN: TheScrublet
You'll need to specify the date you "bought it" , also quote the serial number.
This is all at redoctane's warranty page.