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OK, but I don't think you need to go quite that far. First thing I do when I find a value that is way off what is expected, is to start examining that circuit.
Once a problem is detected, I like to track it down rather than look for other problems. They might very well all be connected. Fix that first problem and any others might well be resolved.
It was suggested you start with the 12CA5 because it is a crucial piece of the power supply.
Check the resistance readings, soon as you find one that is waaay off (ignore the filament), trace out the connections to that pin.
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