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Monitor came out of a Donkey Kong Jr cocktail cabinet and was working but the owner couldn't get rid of the rollover. No other problems were reported so I did a mainboard recap and checked the caps I was pulling on a ESR meter. Several of the 1uF 160v caps were bad and others were borderline.
After recap I tested the monitor using my Donkey Kong cocktail cabinet for the isolated power supply, and adjusted B+ to 108.1vdc. I then adjusted the screen while using my tpg for signal and the monitor no longer had the rollover issue. Hopefully it will run for another decade without issue!
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