Thanks for the advice guys. Will get into it on the weekend and see if i can track it down.  I did replace the diode on the coil that kicks the ball out of the trough and also fire the ball, though the reset is before the ball is kicked onto the playfield. no success.

Now it has just occurred to me also, doh, that on the old power board I changed the GI connector and switched it to a .156 trifurcon molex connector.  Now I am wondering if this connector is not suitable for the male pins on the new pinscore which is probably for the old connector????

If you agree, I might have to take off the male pins on the new pinscore board and put the new male pins i still have which match the trifurcon molex connector.  But the GI connector does seem to fit the pinscore, but as I said I am sure the male pins on the new board are not for this type of connector!!!  If this is the case, maybe this is the issue. Would that GI connector affect resets????

Anyway, will start with your advice and see how i go.

Thanks for the help