QUAD 57 repainted EHT unit arcing...

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Last time I powered up my panels with the completed EHT, I got attention on a faint sparking sound, about 2 arc per a minute.
The source was the red circled spot, next to the edge of the transformer.

May this because of that I painted these 'rails' and there is no continuity between them and the transformator? I had no luck to see if the arc jumps between the two or only between the transformer's laminations.

Thank you for your help in advance


An externally hosted image should be here but it was not working when we last tested it.
 
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