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I finally got around to working on this TV again, and wanted to thank you guys for the help!
I was able to get the UHF tuner back up and running - it was just incredibly dirty and a quick spray of contact cleaner on the 3 tuning caps (and the required wait time for it to fully evaporate) fixed it right up!
VHF on the other hand is still broken. VHF low channels will show a signal off-tune, with the fine tuning not doing anything (I verified the fine tuning is physically turning the slugs). VHF high is stone dead. I gave the tuner a full cleaning, but no improvement. Voltages look correct (if I recall I saw 18vdc on VHF, 12vdc on UHF). I'm thinking it's the oscillator not running but I'm not knowledgeable on this to go further, nor do I want to dry and remove any tiny parts from the tuner!
At this point I'm happy since the TV channels I modulate in my house are all UHF anyway.
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