There's nothing wrong with using the warranty for something, especially a fairly expensive purchase like a Treo. Just curious...I understand your volume's been going downhill, but do you have volumeCare installed, by any chance? I'd recommend downloading the trail version and seeing if that fixes your problem. I only suggest this because I'd guess you'd be getting a refurbished Treo if you do a warranty exchange. While many people have had luck with them, some have had issues.
http://www.handango.com/PlatformProd...oductId=164035