I am in the process of completing a PF swap on my Flash Gordon.
Switches would correctly prior to PF swap.
Have a switch issue for the following switches on the same column, SW don't register

Sw #12 Right Side lower Target wire colors are Brn/W ORG
Sw #15 Right Side Upper Target wire colors are ORG/Blk ORG
Sw #14 Left Side Flipper Feed lane wire colors are W/Brn ORG
Sw #13 Right Side Flipper Feed lane wire colors are Brn ORG

Common point for all SW is A4J2-2

Performed SW Test - no detection
Check continuity between A4J2-2 and orange wire on SW. Continuity is good
Check for diodes on switches shorted - no shorted diodes
All SW have 1N4148 diodes.

Any thoughts greatly appreciated.

SW are original untouched during swap.

Jumpering across wires activates SW and they read correctly in SW test.

Since its only four switching diodes I replaced all four diodes.

No change, still no detection in the SW test.
Diodes were installed correct.

Any other thoughts?

Attached pics below showing orientation of diode. Flipper inlane sw and stand up target on lower right of PF.

All connectors on MPU have been repined.
Switch out Alltek MPU with another known good working MPU from another game.
SW still don't register in SW test mode.
Checked continuity between common side (orange wire) and A4 J2-2 on the MPU.

Any thoughts?

image (resized).jpeg

image (resized).jpeg

Common wire on all switches is non band side of diode.
In sw test jumpered to bypass diode, no detection.

Compared wiring to another FG PF and it matches

Any thoughts?

Would it make sense to disconnect orange wires (common in sw column) and jumper one at a time to see if I get detection in sw test mode?

According to the schematics in the manual these are the only four sw on that column.

Any other thoughts?

I will double check the items you have listed, also verify will verify the pin out of the connectors.
Just thought of connectors, they were repined during restoration.

Provided answers in the quote

Did some more testing tonight.
1) Verified all wires are in J2 Connector are correct.
2)Ohm out all sw to verify continuity by closing the SW.
3)Verified J2 connector pins have continuity to PF.
4) on PF stripped back common source wire to all SW to make sure had a good condition and jumped over to the SW. Still no detection in SW Test.
Don't have a scope only DMM.

Yes it was a short that was caused by PF rotisserie. Once game was dropped into cabinet issue went away.