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4 pole chassis connector, grey D-size flange, mirrored self tapping screw holes (A-screw), vertical PCB mount, https://www.neutrik.com/en/product/nc4mah A Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, vertical PCB mount, https://www.neutrik.com/en/product/ncj10fi-h-0 Combo I series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, retention spring instead of the remainder of the bad trace. Single-step button (SW13) isn't producing a high enough voltage to trigger steps. Replace C10 with 100K resistor.

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