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C322 as a suspect makes a lot of sense, especially if it's tied to horizontal linearity at higher scan frequencies. XGA would push the deflection system harder than VGA or SVGA, so a cap on the edge of spec might not show issues until then. ESR rising past 10 ohms could absolutely distort the waveform under load. Without schematics, starting with parts known to fail under similar symptoms is solid strategy.
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