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Vertical oscillator frequency is far too low at 19 Hz. - should be 60 Hz.
Everything following that seems to be self oscillating at 480 Hz.
Because there is feedback involved, the problem could be anywhere in the feedback loops. The only thing I could suggest is to check components from stem to stern -
check all those electrolytics from C24 to C28 and also verify that the previous repairer didn't install any backwards; check R77, R5, R78; check T2 for open windings.
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