Yes, I'm not sure exactly when, but in the 60s United did switch it so the
pins tripped the Bank Relays and before it was vice versa..
If I'm not mistaken, on your machine the pin deck is attached to the head,
right? Pin switches are hot wired right to the Pin Relays in the Relay Bank?
Does some of the pins seem to pull their corresponding relays 100% of the
time and it's always the same few that have the problem?
I'd maybe first recheck the Pin Relays closed switches when the Pin Relays
are in the reset position.
With the pins made/up, stick a small screwdriver in between the what should
be closed switches in the Pin Relays that hadn't but should have energized.
If almost all 10 pins randomly have the problem, then we'll probably have
to consider other options. I'm sure you have, but carefully checking the switches
solder joints is always worth doing. I've seen jumpers that you swore were okay,
but come to find out, they weren't..