[Mothy]

Did a bit more discovery stuff last night and found that insulation on the wires into the warm-up regulator had lost their insulation and were likely shorting out.

Disconnected the engine wiring harness from the car (big 14 pin plug) and did some resistance tests for the connection between pin 10 and the WUR connector plug - was getting closed circuit on both connection in the WUR plug, although one was higher resistance than the other.

This led me to check the Auxiliary WUR on the right side (turns out I do have one) - disconnected the plug from that and my resistance measure issue disappeared it was picking up the resistance in the Aux WUR = OK.

So now I have isolated the short in the WUR plug lead and are checking for anything else on that circuit.

In the wiring diagram it shows a Supplementary Air Valve in parallel electrical connection to the WUR. Are the Supplementary Air Valve and Auxiliary WUR the same item or am I still looking for something else?