Im repairing this Fisher RS-2004A for a friend, he has a sentimental attachment to it. Typical symptoms before total loss of sound - one side went then the whole thing. The first thing that's apparent is the fuses were blown in the power supply, but Im not sure why. I did a diode test on the bridge rectifier, and I think it's busted: AC -> neg DC = .521 neg DC -> AC = .525 AC -> pos DC = .521 pos DC -> AC = .525 The other caps look heat affected - the whole board has symptoms of heat damage. What's the first step, assume the power supply needs rebuilding before I can check the power amp?