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The vertical output transformer and yoke are certainly worth a careful look. I'd also double check the values and wiring of any capacitors you replaced in the vertical section. Also note that the vertical centering coarse adjust switch on these sets often has very dirty contacts, so check to make sure that isn't causing a problem.
Did you replace the big Candohm resistors? They have a high failure rate in this chassis. Since you mentioned replacing all large dissipation resistors, I presume you did.
And almost certainly I imagine you have swapped out the vertical tubes.
Can you check all the voltages on the tube pins in the vertical section and see if there are any significant deviations from the service data?
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