NotTaR of Television Sets : Trailing lines in one or more colors    
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Trailing lines in one or more colors

Assuming this is not a form of ghosting resulting from poor reception conditions, then it could be any of the following:

One simple test would be to swap two of the color outputs to the CRT pins. If the behavior moves with the swap (i.e., from red to blue), then it is likely an electronic problem. If it is still the same colors, it is probably the CRT.