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glad you found it, it does not take much to mess up a hand wired chassis.
I was checking a B+ for ripple, the set was on its side, the scope lead very lightly was hanging from the B+ and just bumped a disc cap that happened to have very thin leads. Well that pushed the cap lead against something it did not like. No smoke No damage and No pic, just the raster (it was an IF cap).
I was totally baffled how hookin up a scope lead to the B+ would cause a loss of signal. I just started looking very carefully to what I had just done and and tapped around that area, very very lightly. well the signal would pop back and then be lost, looking more I saw the cap right under the scope lead, eureka, I see it.
Moral of the story is when some works and then stops working , triple check all around where you were just before the loss. I have run into this several times, very old wires that break, parts move etc...
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