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Fender Princeton 350 / SN# M1430682 / type 574 shut down, hot heatsink

After  a few minutes of use the volume goes down and a loud crackling noise comes out of the speaker and when I play  my guitar , it all distorted.  Recently it shut down altogether except the power light stayed on.  The heat sinks in front of the amp reach 165 to 175 degrees F at the terminals while all other connections are 80 to 90 degrees F.  Visual inspection of the amp components, does not reveal any bulging or overheated components.  Can you help?f