OK the transformer and wires, plugs etc. under the playfield were hacked/loose all over the place, so it's all been resoldered and test point readings are fine.

Push the start button, the machine fires into game mode, the sound starts, the 'glass relay switch' on the solenoid driver board clicks, but, the ball does not shoot out, the solenoid does not kick.

Any ideas on where to go from here?? Solenoid Driver board??? Thanks.