Noticing the leads sticking up up from the underside of the PCB, I can’t help but wonder if any of them might poking up into and thru the felt pot insulators. I learned long ago to invest in an excellent pair of side-snips and always clip my leads as close to the PCB as possible. I also use the hard or soft plastic pot covers that can’t be “poked” thru by any protruding leads. The plastic pot covers also insulate the sides of the pots for those circuits where pot casings might be possessed of different potentials. That’s all I got. Everything else appears OK.