PA5 Schematics and help anyone?

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I have a Nakamichi (stasis) PA5 that has went bad. I was hearing this humming noise after the unit would heat up several minutes. I usually wouldn't play it long after that but I forgot one day and came back and the amp was dead. I found a bad thermal fuse on the limiter board but it keeps going after replacement. I don't have the exact replacement but sub a 2 amp pico. It blows immediatly. Does anyone have any ideas or a schematic they could email me? I sure hope its not the transformer-looks like one of a kind!
 
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