I've been wondering if it could actually be a mechanical problem so have the hood up now and checked operation of all solenoids manually (for free/easy operation) and found right kicker sluggish and not fully returning to home position though it seemed like enough to open the switch but hard to see .
I have pulled it apart , cleaned it up and fitted a new coil sleeve .
Also found the switch blades bent so have straightened them up.
Just doing the left kicker while I'm at it and will then fire her up and see what happens