FYI for those of you who have Walkabouts with loud fans: My WA is 6 or 7 years old and hasn't been updated for a couple of years. Even though it is out of warranty, I decided to take it into an authorized Mesa dealer for the more recent updates (passive/active switch, effects loop bypass switch, etc). I didn't even mention the fan, but when I got it back, I noticed a reference to "fan upgrade" on the service bill. When I got home and fired it up, the fan was much quieter than it had been, in fact hardly audible at all. By the way, even though it was out of warranty, Mesa did not charge for the parts. The total bill was just over $100, which also included fixing a loose connection which had been causing the amp to cut out. Walkabout owners who are bothered by the fan noise may want to check this out (especially if your WA is still under warranty).