My 4 month old 6500 has started to make excessive fan noise. It sounds like a possible bearing starting to go. It's best described as a clicking sound. The issue comes and goes but is excessive when there. This is during normal receive when radio temp is @ 28C as reported by DDUTIL. This is not the kind of issue I would expect to have with a new $4300 radio. Can the fans be replaced easily or does it require a trip back to Texas?