I would agree with Eric's diagnostic. Dust spots are mostly dark/dark color. I've yet to to a white/light colored one. White hot pixels have been reported on JVC camcorders, but, IIRC, that was a couple of years ago.
You'l probably have to send in your camera for service.
You could also try to post on specialized camcaroders forums or ask Chris Sanderson
if he has an opinion on your issue.