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That's not from a short. Could be some air has leaked in or the ion trap magnet is not positioned correctly causing some electrons to strike a metal surface. Or possible electrons hitting a glass support structure causing fluorescence.
A lot of these early sets were retired not because of a major fault but because it was replaced with a newer model with a bigger screen.
I recently finished restoring a very similar 8T241. I only needed to replace one part (vertical oscillator transformer) to get it running fairly well.
All of the electrolytics in mine were very leaky (15+mA leakage after hours of reforming) and replaced.
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