I think I've now found all the faults .. but can't be sure till I can play a game .
Put an order in to PBR today for the pop bumper coils + some other bits and pieces so soon as I get those I can finish putting the game back together.

The key problem that had me stumped ended up being simple , and something I should have checked 1st ! The score motor home switch was out of adjustment so the score motor was only turning 180 degrees and then stopping.
Also found the latch/trip relay (which is at the rear of the playboard on this game) was not working at all .. mechanical problem.
Found a number of other switches out of adjustment along the way.

Hopefully I’ll finally get to play my 1st ever game on this in a week or so