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I don't have any information on the fans as I never had to touch them. I don't remember exactly where I put the thermal switch in the case, but locate where the opamps are and just install it there with a little thermal paste. I would let the amp run for a few minutes and figure out exactly where the amp gets the warmest and put it there. Next time I can pop the top on the amp, I'll look and see what the temp on the switch is; maybe 35c?