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So I finally solved it! - It was a dead wire for the Direction Valve.
I brought out a multimeter and tested the plug from the wheel arch to the valve block, everything was fine. I then tested from the wheel well to the computer box and lo and behold one of the two wires for the Direction Valve is dead.
There is yellow/black and a blue/black wire for the Direction valve and the blue/black is dead. It is broken somewhere between the computer box behind the glove box and the wheel well. It is almost impossible to see anything in under the dash so no smoking gun to take a photo of.
I know this is the issue as I spliced in a new cable temporarily and the error code was gone.
This was after I swapped in the new Dynamic Drive valve block with all new sensors and solenoids.
Side note, removing the wheel well liner is a difficult job!
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