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Zenith did tend to run their power transformers hot...However I think you may have a problem creating extra load. First thing is that you should look for white tubular ceramic cased caps (the bad type of "safety caps") by the flyback (above and below chassis) if present change them.
I'd also check bias voltages on the horizontal and vertical stage transistors especially the outputs...If there is a drive problem causing their bias current to rise that could trip the breaker...You might want to time your measurements out to be close to the trip time in case it is a part that likes to fail as it heats up.
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