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I'd change caps C2 77, 78, and C80. Especially C2. Check R6, 76 and R77 too.
Paper caps short or develop excessive DC leakage current and can absolutely kill vertical oscillation and coupling to the output...you already saw what the CRT grid coupling cap leaking did to mess up brightness bias on the CRT...If the osc or output gets mis biased from cap failure leakage current the osc can stop dead or the output can have it's signal cut off.
Any section that has original caps you should expect to find dead and be surprised if it still works.
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