Ok, I have continuity from the 3 power wires from 3J3 (power driver) pin 7 to the playfield harness and pins 6 and 8 to the coin door lockout relays.  One of these looked absolutely shagged, i have read on the pinrepair site something about these.  I quickly disconnected the ground from these and powered up but it made no difference to the symptoms described above.  I guess i should bypass these and connect up the two power wires directly from each lockout coil?  I'm wondering if this also has something to do with the coin door menu switches not working?

No need to have the coin lockout coils in circuit - just remove them and insulate the wires if you wish, but maintain any loopings in place.   Certainly do not connect up the wires - that will blow a fuse instantly.  If I understand what you're saying correctly, it's not likely the lockouts are causing you problems. Generally a coil will fail in one of two ways - open circuit so it does not work and does no harm. or short circuit where it will blow a fuse.  You have neither of these cases.

I'd examine the solenoid bridge and find the negative terminal, then measure the voltage from bridge negative to any coil terminal which has two wires on it - this will be a positive. You should see 28V, but my guess is you are not seeing anything. Follow the wires from the terminal with two wires back to the power supply board, lack of continuity here is likely to be the problem.