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Just change all lytics and paper style caps, and the seleniums. Trouble shooting it with all those crap parts in it would be like trying to plug the holes in a boat with a chicken wire fence for a bottom. Lytcs usually don't just short, they can leak current at high voltage which you can NOT test for with a DMM, and this leakage may not be constant in magnitude.
60's sets may be worth troubleshooting, since their lytics, and mylar/paper caps are much less failure prone, but everything made before the late 50's (and select sets into the early 60's) with the older style caps just ain't worth trouble shooting with original caps installed. And even if you were to try with proper equipment (a tuning eye type capacitor checker such as a Heathkit C-3) you'd be hard pressed to find 2% of the caps good in most sets of that era.
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