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If you haven't already, Defo worth replacing C5 and C6 in your vert O/P stage.
Leccy-lytics lose value and dry up over the years, and in vertical timebase have a pretty hard life.
Any high value resistors in Height and Linearity control networks are also suspect.
Poor vertical lock could be issues in the sync-separator circuit, look for bias resistors of around 2.2M (Common issue on a couple of UK Hybrid TV sets, guess much the same applies if you have a Transistor doing sync-sep in yours)
A tip that was told me when I started out as a Trainee 40 odd years ago for setting up Any color TV....
Get the picture as good/perfect on Black/White First, Then worry about color after--Or you'll chase your tail!
--Its worked out pretty darned well during the last 40 years for me--so there must be summit in it!
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