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With the HV cage off and all the lights turned out, you can play the set briefly and try to see exactly where the arcing happens.
If you have done soldering in that area, make sure the solder joints are smooth. No sharp clipped-off lead ends, pointy bits of solder sticking up, etc.
If there was continuous arcing in the past, that can leave a trail, or even tunnel through something like phenolic. If you haven't already cleaned the area, I'd do it now and look for anything like that.
Doorknob capacitors are pretty reliable, but anything can fail.
Phil
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