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First thing I would do is run it with the back off and flex the boards with a stick and look for a change. Could be a cracked solder or poor connection somewhere.
Could be a retrace issue or the crt is being overdriven. A ground or component failed in the screen, drive or video circuits.
Does it seem much brighter that before?
Im sure I have the service data on that chassis and can dig it out for a date with the scanner.
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