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I would not use engine degreaser. Any oil on the tuner chassis helps avoid rust and corrosion. You don't want to overdo cleaning. especially in areas that it does not effect performance.
It occurs to me that Predictas have a plastic cover on the CRT front.
Is this plastic clean and in good shape?
There could be deterioration and/or mold on it.
Your VA62 needs adjustment, but it is a very complicated unit. Probably more needed than just adjusting the line width. I'm saying that if one adjustment is off there could be other adjustments to check controlling other test outputs.
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