Hi Basil, I’m presuming if your bike is mint it has fairly low mileage? I would think that steering head bearings should last a hell of a lot longer than 10,000 miles. I have nearly 30,000 miles on my 2015 and the bearings are fine. I realize this is a 2007 model but if it’s in mint condition then the previous owner/owners have obviously looked after it. Have you checked a balancing weight hasn’t fallen off the front rim?
I hope you are enjoying the America apart from this issue. Love to see a photo.