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Besides T4, you should also check for continuity on both the primary and secondary of T2 in the vertical oscillator. That one will be easy because you won't need to disconnect anything.
R3 is in the cathode of the vertical output and sees quite a bit of power which is hard on it. You should check to see that it has the correct resistance.
R4 supplies the plate of the oscillator and could be bad too, but it doesn't see as much power.
You might need to try substituting the 6C4 also even though it tests good. It might have too much grid leakage which might not show up on your tester.
John
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