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I have the same set nut is talking about, a packard bell branded one of those and I had to replace the SCREEN pots to get all the colors working. You are right about them going bad.
This should be easy to diagnose.
The wire colors going to the crt socket are all EIA standard colors on every set. All the yellow w blue, red, green stripe are the cathodes, The white with b,r,g stripe grid, then the 3 solid color wires screen.
All in the groups of 3 should be about the same. IE all the solid r,b,g wires should all be around 600v. the yellow w r,b,g all around 150 etc.
You will find it fast using this method.
Ohh and you can use the voltages from any 22 series tube. Even a 21FJP22 will have about the same voltages.
If you have a model number or chassis im sure i have the schematic.
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