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The candohms are not uncommon to find shorted to chassis or open, and the tubular ceramics do open sometimes (changed an open one on a 721TS this spring).
One small concern I have is your mention of bypassing a resistor section...If it wasn't an end section and it isn't open or more than 10x above its rated value it's hard to bypass it without the original throwing things off or extremely delicate surgery to force open the original.
Personally the B+ voltages are close enough that I wouldn't be chasing them as a cause of any other issue.
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