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I think, unless you are very lucky and stumble onto something, you are going to have to get some more test equipment.
Many times when something is seen on a TV screen it will give a more definite cause of a problem and a scope will not be necessary. Where the image is distorted in both the horizontal and vertical directions however diagnosis is very hard. A scope would straighten things out rather quickly.
I believe your meter was trying to follow a moving target when looking at the vertical output. An interaction between the measuring cycle of the meter and the vertical signal.
Normal trouble shooting methods would look at the power supply to the suspected circuit stage first, however in this case the power for the vertical output originates in the HV CRT supply (after going through the voltage dividers). You can't measure the HV without a HV probe for your meter.
It looks to me that some supply or something else is cycling up and down over a second or two.
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