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Spread the wires flat behind circuit board to avoid case and mechanics and label each temporarily before pulling through switch hole
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Set the AF-MF switch to AF and carefully remove its plastic toggle cover
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Heat the outside face of each connector other than DLC with a tinned iron while holding the tinned wire pad to it to fuse each pair
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Tin the inside face of each circuit board to contact connector other than DLC generously
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Tin the formed solder pads at the ends of the wires generously
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Cut a length of ~26 AWG solderable magnet wire for each pin but DLC and curl and pinch the ends to form narrow solder pads