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if you have a way to monitor the AC line current, I would start with that. if excessive (more than 3amps) then you know the breaker is doing what it should do. If its high, have the power supply caps been replaced, shorted caps would be 1st thing to check for excessive leakage. Another likely short would be the horz output transistor, those are under a lot of stress. You should be able to pull it out of the circuit and do a standard transistor check with a VOM or a DMM in the diode mode
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