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You will want to replace the vertical drive integrated circuit, and the 6 or 8 caps associated with it. The usually are just one or two 105 degree caps, replace them all with 105's. I have done this for several monitors and tv's with vertical problems, and without schematics to boot.... both the stone cold dead stuff, and the vertical non-linear effects that yield temporarily to thumping the unit.
Just download the data sheet, which usually has the test or recommended circuit contained within.
The Vertical Drive IC's should be easily available too.
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