"Eric Vey" writes:

Monivision 21" 5 years old. Too much Blue BG, so no black.

When I went to turn it down, I found that it was already down as far as
it could go and probably came that way from the factory. Turning up red
and blue BG starts messing with my white and then I have to make the
driver pots compensate.

Tube seems okay for it's age. Takes about 5 minutes to warm up fully
from stone cold.

I am thinking amplifier board. Are there instructions on the web on what
to test since I have two good circuits?

Sounds likely. Since you do have two good channels, it should be possible
to swap connections or components to narrow it down.

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