With the Play Field tilted up inspect the bottom of the kick out holes, there will be a plastic trim. Check that this piece is not sagging or broken.
Check that the switch contacts for the kickout holes is clean and adjusted properly.
Look closely at the tip of the kickout hole actuator assembly, basically the very tip that strikes the ball.
Is it sharp? Gentle filing or replacement may be necessary.
Is it bent? Straighten with pliers or a vise (must be removed from the machine).
Clean or replace the coil sleeves. Align and tighten the coil mount.
LIGHT lube of a medium thickness at the pivot sleeve for the arm.
Of course,inspect the wires firing the coil and any possible shorts in the area.

the score motor "index contact" should be the top one closest to the score motor

tighten the stack, clean and adjust that switch , it should be closed until the notch in the cam opens it

Unattached wires in that area is normal. Don't ask me why.

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Hey I'm the guy that visited Doomer & his Wizard!.

The score motor was very sluggish and had the proper voltage applied to it. I was going to disassemble to clean it but it was riveted together. The product I used was "Super Lube All Purpose Oil" https://www.pinballlife.com/index.php?p=product&id=4499 only pouring some into armatures shaft hole. after running a few time it was working pretty good.

That got it so we had a playable game.

the player up unit was sluggish as well and Super Lube synthetic grease was used on the hub & rivets after using "the magic brush" treatment (dremel tool with wire brush)

I was getting fatigued and couldn't wrap my head around the flags. I recall the number 3 target was the only one that worked properly. it would flip ONLY when the standup target called it to flip and would un-flip when the ball was rolled-over the right lane

#1 would flip and unflip with the standup it would also unflip with the right rollover
#2 would flip with the standup and wouldn't unflip with right rollover
#3 again would flip with the standup and only unflip with the right rollover
#4 would flip with standup and not unflip with right rollover

the schematic was there but again I was tired the manual would probably describe the order of operations (relay/score motor-wise).

I didn't look at the "coin count" stepper unit for dirty contacts and would suspect that's where the credit situation lies

It is a beautiful game and was glad to help get it to where it is play-wise. was also a pleasure to meet Doomer I think you will be able to get this machine dialed in nicley.