Um, it's right there on page #94

His problem is that there is TOO much power at the coils.

I've just followed along until now but you will need to provide some additional information to resolve this, using a voltmeter. Check for DC voltages at the lugs of all coils. Put GND black lead on the side rail of the cabinet and put the RED lead on each coil lug in the game.
What DC readings did you get?

Check your AC WALL VOLTAGE at the plug.
What AC reading did you get?

Confirm you are not using an extension cord, power regulator, or power inverter/generator.
No?

Additionally, confirm that all your boards are grounded and that the ground braid screw in the bottom of the head is actually connecting the lower and upper cabinets with your METER.
Yes?

No worries, I understand and I thought you may have just overlooked the first post.

I have my suspicions about the actual problem but want to confirm AC power at the source and the coils first.

Another thing I would confirm is that all of your fuses in the game are of the proper rating and none are bypassed.

I’m putting my money on a bad rectification on the AUX board. Can you test all the diodes and large transistors with a voltmeter on the AUX board?

I do not think this is the source of your problem and I do not believe it will resolve your problem. 115-125VAC is within the normal acceptable ranges for US homes. None of your other games are affected, and you have confirmed the same source AC voltage on those machines.

Also, how did the game act this way when it was at the guy's house you bought it from? He said it had the same problems when he owned it.

Reducing the line voltage to a point where the game's solenoids work properly (well below 115VAC) will reduce the other voltages in the machine and is likely cause other problems like game resets. (a low 5VDC condition)

I guess for $60+shipping, at least you will have a cool toy to try out on stuff.

There is more to it than just voltage. Voltage is only one piece of this equation.

Beyond a problem with the transformer, you likely have bad DC rectification on this game.

Take your AUX driver board out of Earthshaker and see if the problem still exists. If it does not, you can place the problem on the AUX driver board in PF causing this issue. Swapping boards is the cheapest and least technical way to test this.(Lower right board in the head.) The AUX board in both games is exactly the same and we've established your Earthshaker does not have this issue.

The Earthshaker does not have any problems. Also, the OP indicated that this Police Force had these same problems at the previous owner's house in his first post.

So you are saying the previous owner experienced these same problems because why again?

Seriously, it's more likely the wrong flipper coils are installed rather than two separate owners of this machine BOTH having too much power at their wall outlets.

Blindly throwing parts at the problem will not fix the issue with this machine.

Oh, and 75VDC is a fairly standard VDC reading for flipper coils in a system 11 games. Even for a game with WEAK FLIPPERS.

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https://pinside.com/pinball/forum/topic/taxi-flipper-weak

Here ya go. On my Mousin’. You can believe whatever you want, doesn’t make it true.
Looks like the increase of about 9 volts AC increases the DC flipper coil voltage less than 2 volts. That’s not going to be enough to cause the issues described in the original post.

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Every system 9/11 game’s voltages that I have ever owned are around these same values and I have owned a LOT of them.

I’m not looking in there to check on the coils. It’s not relevant.

Many things can cause this. Connections, corrosion, partially failed brides and diodes, etc. The board may still need to be serviced, even if it’s working now. I have seen this quite a few times with games that have a AUX boards. Glad you figured it out.