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How many of the caps are original? The orange and maroon drops of the era don't fail shorted like papers, but instead fail high ESR/open. I'd probably replace the drop style caps in the sweep stages as a precaution.
It should NOT have variation in height or lin with warmup...Here in the states there is an old TV serviceman's trick for troubleshooting this. Let the set warmup till it is doing it noticeably, get a can of freeze spray (canned air for dusting should work too), and shoot individual caps and resistors in the suspected stage one at a time (vert stage) until you see the problem correct it's self...The part or parts that when sprayed correct the issue are prone to excessive thermal drift and should be replaced.
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