many thanks neale, after all the grief I got about my soldering skills (or lack of) that was my first port of call but they all look fine. I think I have found the problem. I have tested all the pins against each other and found an inconsistency with limit plug no2. All the other tests on the other plugs behave the same but when I do the same test on the no 2 plug nothing happens. There doesnt seem to be a visible circuitry on the pcb so i am guessing this is enclosed within the pcb somehow? uploading a vid now