Gday Adam .

I've just reread the whole thread and had a look at the schematic.

If you look towards the bottom of the schematic you will see the flipper coils . See the power to those coils is from the 'red' feed. If you follow the power feed up the right side of the schematic you will see it passes through a normally closed switch on the tilt relay (red wire on one leaf, red/yellow/white on the other) .
 With the game unplugged from the wall , check with your meter that switch is closed . If that switch is open you will lose power to the flippers and the top eject hole relay, right lane target switch etc .

Also, further up the power feed it looks like there is a switch on the reset relay that should also be normally closed (red/yellow/white wire on one leaf, blue yellow white on the other) .
If that is open you lose power to everything down the chain towards the flippers including the ball release coil .
It should be closed when the reset relay is deenergised ie. with the game unplugged from the wall and when the reset relay part of the reset sequence is completed)

Lastly , just above that switch on the power feed there is a switch on the game over relay that should also be closed when G.O relay is deenergised (blue.yellow/white wire on one leaf, black on the other) . G.O relay will be deenergised when ball count is > 0 (or game is unplugged from wall.)

If either the switch on the game over relay or the switch on the reset relay is not closed, there is no power to the flippers or any coil between the flippers and that particular switch.

Cheers
Dave