Switch 55, 56 and 57 represent 3 micro switches on the underside of the playfield for the fork ramp.

1) Take the glass off and take the balls out of your game.

2) Put the game in for ramp test mode.

3) Lift up the playfield.

There is a motor for the ramp that rotates a gear to activate each of the switches. Each switch is a different position for the ramp.
You have one that’s bent and not activating.

With the playfield up you should be able to run though the fork ramp test mode and see which one is not activating.

I had this same problem with mine.

Switch 56 is probably slightly bent and not activating.
You just need to bend it slightly back into position.

Testing it by hand won’t matter.
It’s unlikely you have a bad switch, hence by hand it should register and seems fine if you test it that way.
There is a white teardrop shaped gear/cog on the motor that rotates to hit the spring on the switch. If the spring is slightly bent the gear/cog will not activate it when the motor rotates.
Hence a manual test will show it’s fine.
It needs to be activating when the motor rotates to that position.

I literally just solved the same problem on my machine on Saturday morning.
I have a Comic Book premium on location and it was doing the same thing, only switch 57 was not registering and would skip it in test mode.
My money is on a switch that’s bent slightly out of alignment.

If it was simply wired wrong the switches would just register out of order, not skip one.

Yes, it’s the little arm that comes off the switch with the “roller” on it.
It only needs to be bent a very tiny amount. Like really tiny.
Just enough so that the teardrop shaped cog on the end on the motor engaged the switch when it’s in the correct position and disengages when it moves to the next position.
Your switch it most likely bent slightly down (away from the teardrop sapped cog), hence it passes right over it without engaging it and moves on to the next position.

Exactly, but if he has one not registering it will go 55-57 or 57-55, totally bypassing 56.
If he tested the micro switch manually and it was working, then the problem is it’s not engaging. His ramp is only hitting the two positions and it really doesn’t know what to do. The motor will spin to that position, but roll right past it because the micro switch never engages and the ramp never goes down.

When you get home do that test with the play field up so you can visibly see that teardrop shaped gear/cog move when you change positions in test mode.
You will be able to physically see when it moves to each position and which one its bypassing or only occasionally triggering.
Whichever one it rolls right over and moves on to the next is going to be the one thats out of adjustment.
Even if it's only slightly bent, it might register sometimes, and sometimes not.
When working correctly it should stop at each micro switch (position 55, 56 or 57) and the ramp should be in said position.

I don't know in actual gameplay if it's registering them from right to left or left to right, or both.
I suspect its only one directing in game play, but I'm not 100% certain, if so it would account for why in test mode it registers one way and not the other.

Make a video of what the mech is doing on the underside of the play field when you go though that test.
Basically the teardrop shaped gear/cog rotation though all the switches.

While you have the play field up, check to see if the motor itself is loose at all.

I still think you have a switch thats intermittent.
Basically just barely making contact since it works sometimes and doesn't others.

Go though that full rotation a bunch of times in a row.
Like five or six full 360 rotations one direction all the way though all three switches and keep going, and the the same in the other direction.
You basically want to try to replicate what you were getting earlier where it was skipping over a switch.

Or you could just try lightly bending the switch thats been having issues towards the direction of the teardrop shaped cog to see if it making better contact and solves the problem.
If those things are very slightly bent out of wack they will act like this.
Don't bent it too much though, just enough so that when that cog rolls over it that it makes good contact and triggers the switch.

Is your problem solved after moving the switch?

Interesting.
We’re you just using the flippers to move position?
When I was fixing mine I used the service buttons in the coin door (never used the flippers).

Ok.
When you lift the playfield up, check all of the switches one by one by hand to see if one is stuck in the on/engaged position.
After the teardrop has passed over them, push the spring down by hand and you should hear it click. Do this to all three of them individually.
If they are too close to to teardrop shaped gear/cog they can be stuck in the engaged position. They need to be open except when the teardrop shaped cog passes over them in its rotation as this is what activated them sending the ramp into said position.
Check the switch you moved and make sure it’s not stuck closed/activated. If it’s a little too close this might be the case.

As I mentioned before, my machine is on location, but its right down the street from my house and I can take some pics for you in the morning if you don’t get it sorted out.

That’s awesome, congrats.