Quoted from Jmckune:These two switches did not change state after unplugging the switch matrix.
When you also unplug J212, does switch #12 'Dozer down' open ?
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Quoted from Jmckune:I did not try unplugging J112 on the power driver board. What function does that have?
Those are the cabinet switches. The wires that are used are also the same color as the 'Dozer down'-switch. In case of a short it could theoretically be caused from here.
Next thing to try is to disconnect the ribbon cable between CPU- and PowerDriver-board (power machine OFF first)
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