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That happened with mine as well. The small opening in the back of the VHF tuner, on the top left, is a convenient place to spray contact cleaner where it will flow to where it's needed. Better that than pulling it and opening it I figured. You mentioned Radio Shack contact cleaner which is what I use. Well, it's no longer Radio Shack here, it's now The Source. Anyway, giving it a good spray and cycling the tuner a few times worked like a charm.
I see vertical linearity needs a touch-up as well.
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