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+1 for suspect PSU.
For indirectly checking the PSU, measure the video amp supply. Is derivated from flyback and usually have 175 to 200V. Suspect if less than 175V. All other flyback derived supplies will be low also then.
Is very uncommon but I've seen sometimes the H tune pulse capacitor (the ones with 1600V ratings in parallel with HO transistor) changing value to less, due to defect (near self destrucion), making image to shrink, but normally this makes all flyback derived supplies to rise (including the video output supply), and affects only the H size. Not seems to be the case, but anyway, if you have a capacimeter...
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