Thanks for all the advice and offers of help. Tried the flipper tilt test, which was not really conclusive, removeed the back and gentlly removed the sealing glue on the PCB.
Loose cable found on one of the feeds to the solenoid, dab of solder and a fiddly reassemble (love to know how the Chinese put these items together), tested ok and we are know back in business.

Loose cable found on one of the feeds to the solenoid, dab of solder and a fiddly reassemble (love to know how the Chinese put these items together), tested ok and we are know back in business.