Start with checking for power at the affected coils.

This sounds like a issue that shouldn't be ignored. Which wires?

This may mean that the power supply needs rebuilding. How about a pic.

That power supply should be rebuilt, if you find that the fuse is good you may have some cracked header pins on the back of the power supply. You could remove it and take a pic of the back side.

Caps will not fix a non existent five volt, it will remove the AC from the five volt line. You need to test it to find out where the five volt is dieing out at so you get all the parts you need. Shipping is a killer, you only want to order once. If the header pins are burnt they will need to be replaced and not just resoldered.

Connect voltmeter to the five volt test point and turn on game, watch the meter for fluctuations while Cpu is booting. 5 volt should be steady and at least 4.9 volts and above.

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This is a bit low, should be @ 10.5 and above. New caps and diodes on the power supply with help with this. At a minimum replace the 8 electrolytic caps and D-1 thru D-6 with 1n4007 diodes.

Are the fuse holders on the power supply a tight fit to the fuses?

Here is a pic of the power supply connector. Check all 3 red and 1 red/white wire for 34 volts dc with the game powered on. Let me know if one of them is dead.

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Good, now find the big molex connectors under the play field that go to the play field. Use a pair of channel lock pliers and squeeze both half's together. You can test these same red wires on both sides of the connector to see if you are loosing power at the connector.

You need to follow the red wires going to the play field. The red wire going to the back box is for the knocker and the beacon.

Look at the bright side, you were able to work thru a problem and correct it. Nice job. Now rebuild the power supply and you will golden.

Playball!!