I'd definitely go with cleaning the original belt and rechecking to see if that solves the issue. Gates also allows that the use of some CRC 05074 Heavy Duty Silicone Multi-Use Lubricant can be used for anyone who seems to have a chronically noisy belt where soap and water alone don't seem to address belt stiction (vibration) or friction (noise).
I can't imagine the belt has "worn out" with only 3k miles. Short of damaging a belt, they should have a service life of 10k+. In fact, I think we've seen enough reports from high mileage teams at this point to realize the sprockets will likely be what belt-users will need to keep an eye on for cues as when it will be time to order replacement sprockets and a new belt.
Riding in wet conditions seems to accelerate wear more so than purely high mileage.
Last edited by TandemGeek; 08-15-12 at 02:05 PM.