ZD981 soldering iron plug wiring pinout

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Further to my ZD987 post, I've gone inside the case to try and trace the wires and the PCB states ZD981 (which is presumably the the soldering station only?).  Anyway, if anyone has the wiring for this, I'd be very appreciative as I can't work out what does what - there's a triple connector to the PCB but I've no idea what it does as it's not labelled.