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If you have the Sam's or riders manual for it there should be a parts list. All the lytics (they will be in the 2-200uF range and be rated for 25-500v) and all the papers (rated .001-1uF usually 100-600v) should be changed. There will be mica and ceramic caps in the original parts list too... Ignore them, they virtually never go bad.
Check the vert output transformer and vert osc transformer(if it has one) for correct resistance and for primary to secondary shorts before spending money on caps. Also check the vert tubes...odds are the caps are the problem, but tubes are also likely. Bad vert transformers can also cause it, but are much harder to get replacements for (so try to have a good one before sinking time/money in).
Another mild possibility is an open or severely drifted resistor in the vert stage... even if they are not causing the total lack of vert sweep if they are outside tolerance ratings they will cause the vert to be non-linear or off freq once you get vert sweep back.
Lastly if you have the schematic check all the B+ rails that feed the vert stages... if any of those voltages are missing or over 30% low that can stop vert sweep too.
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