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Also, the HV will attract dust. I can generally tell if a set is low hours or high hours by the amount of dust inside.
Concerning the vertical issue, replace the 220uf capacitor and resolder the IC. If that does not do it, replace the IC. If it still does not work, check the B+ voltages going to the IC and investigate from there. That vertical IC should be cheap; so, might be a good idea to order 2 or 3 of them for future use or in case you blow one up.
As for discharging the CRT, clip one end of a clip lead to the CRT ground strap, clip the other end of the lead to the metal portion of a good insulated screwdriver. While holding the handle of the screwdriver, gently slip the blade of the screwdriver under the HV anode cup and repeat several times. If the CRT is fully charged, you may hear a loud SNAP when it discharges.
You should be able to unplug the chassis without fear of losing any memory. As far as what unplugs, you have the degaussing coil, speakers, deflection yoke, the CRT socket board will unplug from the CRT, the HV connector, and there will be several ground connections that go between the CRT ground strap and both the CRT socket and chassis.
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