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Is there a part number on the xfrmr? If so , you can probably find a wiring diagram on line for it. Then, rather than checking voltages, check resistance on the primary and the various secondaries. That way you can tell for sure if any of the windings have opened.
I have seen blown output transistors from speaker cables shorting too. Last I remember(about 15 years ago) those usually have three to 5 legs. Haven't really paid attention recently.
JJ
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