the Motor Switch Chart - look here https://pinside.com/pinball/forum/topic/pin-up-score-motor-switch-position-sheet#post-2599599 - the same as You show in post-12, maybe a bit better for "print out".
To Your post-55
- we must be very precise talking the right / true color of wires, switch positions etc.
- "leaf" - good - a simple abbreviation of "solderpoint of a switchblade where wire of color XY is soldered-on"
- middle switch 4C, outer switch 4C, jumpers etc. --- we must live with the fact "the schematics are drawn abstract / neat looking - the reality in the pin is wired other" - the only thing we can say "I see a (maybe long) connecting wire / line in the schematics, NO SWITCHES in this wiring --- then in reality in the pin THERE is (maybe just a short jumper) a direct connection".
- middle switch 4C --- very interesting the text in the motor sequence chart (post-12): "LB" Relay Control --- the reason this strange looking wiring (through 4C, 4A) is in the pin: NOT for stepping - but for "LB-Relay". When blocking this switch 4C we probably run (in a One-Player-Game ? - in a Two-Player-Game ?) into problem "On last ball actuating the LB-Relay does not work" ...
On behalf of "temporary cut / block this wiring": It does not matter if You block 4C or block 4A --- In terms of troubleshooting I would like You to inspect 4A - truely open when not actuating ?
- the match unit is working --- fine.
- orange mingled with BLK --- what colors of wires do You have on the INSIDE-Switch on stack "motor-4A" - the schematics says "RED-WH", "OR+BL" --- grumble, a fault I often do: I mix up "BLK is Black" and "BL is Blue" --- O.K., I meant Orange-mingled-with-BLUE (((and I read the first sentence in this post, again and again and again))).
- Meaning M4C has the same pulse as M4A WH-OR --- IF, if, if You have the fault in Your pin - the fault I believe You have in Your pin - the fault 'at location motor-4A' You do not have a switch (open, sometimes closed) - You faulty have an closed switch (acts as a simple connecting wire) --- IF, if, if You have this fault: Then You detect "same pulse" but actually it is just the closing of M4C You detect on different places. See the JPG in post-44, upper right corner: 4A must close before 4C closes - 4A must open just after 4C has closed - only for a very, very short time both are closed (in a functioning pin).
- how about f, g, h. --- f: when the PU is in position "Player-1 is playing": P1C must be open so current can not flow - You detect current flowing so P1C is faulty closed. --- g: Hmm, Your observation is good, wanted as P1C must be open when it is Player-1 turn, P1C must be closed all other positions of the PU. Question: How can You have the "f" and the "g" at the same time ?
--- h: I also believe this is right --- the closing of motor-2C let current flow towards motor-1A /PU --- current also flows through closed motor-1C (it is player-2 playing) and further through P2A reaching its side WH-GR. Yes, I believe this is right.
Unfortunately the "h" does not tell if the three-bladed-switch-P2A has faulty all the three blades connected ...
From post-55, at the end "You show Test-Light on P switch gave results 1 pulse on step 5 --- again: motor-4A must open so the "long in time closing of motor-4C" can not fall together with fifth closing of motor-1A --- look if the motor-4A is faulty always closed.
I repeat --- look at the three blades on P2A, look at P1C - then do my suggestion "post-53, motor-4A". Greetings Rolf