Well... we're back again!
Haven't updated the thread as have only been doing everything one step at a time so updates wouldn't be particularly interesting. First, the good news: new Upper PF is installed and almost all the topside is back on. May not seem like much, but for me this was a good milestone. Game boots and I can get to test menu so I've got something to work with.
Bad news - most of the errors are still there. I posted them earlier but as a reminder to those at home:
Check Switch 51 Wall Target Down
Check Switch 55 Battle Drop Down
Time and Date not set
ERR. Mini PFF BAD Check switches / MTR
ERR. Magnet opto is not working
ERR. Battle kicker opto not working
ERR Wall TGT Bad check switch / coil
ERR Drop bank bad check switch / coil
ERR Bat drop bad check switch / coil
I think the majority of these will be due to my ropey (at best) J112 connector. At some point it's been cut:
Trouble is, I don't have a photo of the original configuration, or have any idea how to fix it. If anyone has done this before or has any ideas, I'm all ears!