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foldover in the middle and a hot running horizontal output transistor are an indication of insufficient drive to the transistor. Look for the wire going to the base of the horizontal output transistor and trace it back to the driver transformer. Connnected to the other end of the transformer winding should be a capacitor and resistor. The cap is probably dried out (open) and this overheats the resistor. As these parts fail, the horizontal output overheats and shorts.
Can you post the horizontal portion of the schematic?
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