I'm also thinking the Jan slow gig season may be a good time to get my 15 year old Walkabout up to Petaluma for a tech once over. It did shut down on me 2x during that period (15 years), and those situations were pretty clearly from running it very hard at 2ohms, so no real fault of the amp. The fan is a bit loud compared to the Subway amps I have, but I don't think Mesa replaces the WA fan with anything quieter than the original.
Anyone have any thoughts about doing maintenance without an overt existing issue ? Should I just leave well enough alone ? I wonder if it would come back sounding any different if any major components get replaced.
hmm ...