Decided to pop down to Altronics to get some crimp pins and a crimper to start the solenoid board rebuild. I have ordered from Bony Beast but not sure when the bits will arrive so decided to get going right away.

I have done tree connector replacements (1, 2 & 3 in the image) ... but so far no change in the fault.

So, with a full resolder of the pins done, there are only a few more connectors to do before I start on a full replacement of the pins. So far there have been no signs of and/or burnt or otherwise faulty crimp pins so I hope that this replacement exercise fixes the problem, else I am not sure what to do next..