Best thing cen did a while back was the radio swap programme...where you sent your cen radio in and 50 bucks and got a airtronics mx3 back...it was cens way of saying, hey our stock radios are crap, we will try and make up for it!
You could send your old radio back to them and they would most likely replace it, i found them good for warranty stuff, but would you really want it!
My advice is cut your losses and buy a half decent replacement for it...