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That is the high power circuit for the gas displays. The potentiometer I believe allows you to adjust the output voltage down. Have you adjusted the pot? Be careful that is a high voltage area, the cap’s are likely still charged.
Side note, no issues on the bottom traces?
Quoted from pins4u:A sudden change to the maximum voltage supplied by the rectifier is NOT going to be adjustment of the pot. Pot twiddling NEVER fixes any problem.
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