seems like your initial post is correct ... the problem is the A switch is not taking down the 2 and 8 pins when it should by powering the 2 pin and 8 pin relays.

however, it is dependent on what pins are already flipped up and whether it's the first or second shot, so you've got those playfield / pin control relays altering when entire circuits are active.

the idea was to try and simulate what a ball would actually do if pins were present or absent, and what pins tend to knock over other pins or deflect the ball in a real game.

e.g. hitting the A switch just takes out pins 2 and 8 since the 2 pin is more or less hit center and the ball follows it straight back to the 8 pin. Hitting the B switch on the second shot IF the 2 pin was still standing would take out the 10 pin.

it's not a very accurate simulation, but at least it makes spares possible when you'd normally need a front pin to go one way and the ball another to hit remaining back pins - ignoring lucky pin ricochets taking out extra pins like happens in the real world.

posting schem pics like you did in post #5 would definitely help. Might as well do the entire thing and overlap the shots enough that it's easy to see where the pieces go.

a full shot of the entire schematic is also good. If the resolution is high enough, it can be zoomed in on and read.

if you have an ohmeter, you can also measure the resistance of the player 6 reset coil and compare it to the player 5 reset coil.

if the player 6 coil is infinite resistance, you may be able to fix the coil if the wire just broke off the lug. If you need to, unwind a turn or two of wire to make it long enough to reattach. You have a 50-50 chance a broken wire is on the outside of the coil where you can unwind it. The other end is buried in the coil and you usually can't get a turn of wire pulled out.

your jones plug is mailing out today.

looks like when the adjust plug is in the mystery side, you can configure the mystery frames to be any/all of frame 1, 2, 4, 6, 7, 9

however, the flash motor runs between each frame and randomly makes an enabled frame a beer frame ... or not.