I fixed this for you.

https://www.youtube.com/embed/JAZ32TdN3eE

Edit- nevermind you fixed it right before i got it for you. Ill take a look at mine quick for you here after watching your video alittle closer.

I got your video to work and just made a video for you of mine. Give a me a few minutes to upload it to youtube. Looks like your #55 is bad but i didnt look under playfield to check it out.

It doesnt go from 57 to 55 on mine like i see yours does in your video. I can only go in order 55,56,57 or 57,56,55. It wont let me jump from 57 to 55 without hitting 56 in between. Here is another quick video to show it not being able to jump over 56.

To me it seems your switch wires are backwards or something and not the actual mech since it can skip from 57 to 55. Makes me think 55 is wired backwards. Take a picture of your wiring and ill compare them to mine.

Your more then likely right. My initial thought was a compressed switch also but the skipping over 56 is weird. honkbahh id do what Coindork said first since hes messed with the switches and mech already and experienced the same issue.

Also in your video it shows 55 flashing 2x like its registering it being hit 2x during test sometimes I see. Just a few little tweaks and you should have it. Its common to run into these small switch or opto issues NIB so dont sweat it to much I think you will get it fixed with alittle tinkering.

I have to hit the flipper button each time to go in the corresponding direction per switch. So right flipper goes 55,56,57 and then left flipper to go from 57,56,55. I do it with the coin door closed.