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If it has decent vert/horizontal lock the film caps are probably fine, I've never found a a bad maroon drop but anything is possible is suppose. The shrinking vertical is likely a drifting resistor that feeds the vertical circuit from its B+boost source, so follow the wiring and locate the resistor in between them. Often times I find the value of that dropping resistor needs adjustment, even from stated schematic values in order to achieve a full height raster. Could also be the height pot is out of spec, so check its value.
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Evolution...
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