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That is definitely a horizontal circuit issue. Solid state electronics are far from my forte, but I'd look for lytics with bulging cans, and smoked resistors first....If that shows nothing go through those parts in the horizontal stage with test equipment. Make sure the resistors are within rated tolerance, and the capacitors check good for value, ESR, and leakage.
And listen to anyone who seems to know more than me as they probably will be able to get you more directly to cause of the issue.
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