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The output transistors are probably defective. These are MN and MP transistors available from Sony and run about $12 each. There may be other components in the output stage that need to be replaced as well. Expect about $25-$40 in parts plus the local labor rate.
I went through the amp/receiver and used small star washers on all the grounding screws I could find including the one securing the transformer, cleaned dust off all circuit boards, checked output transistors and fuses, all OK.
Re Assembled unit and it worked OK.
I will buy a fan and fan it to avoid sourcing heatsinks for the previusly suggested IC's.
Thanks for the technical help, sure solved my problem.