Really hope we can get this fixed for you onion.
Many of Steve's posts have helped me diagnosis and repair these things.
If you're comfortable taking the apron off, run the switch test again and move ball from the outhole to each ball position in the trough to make sure everything is good there.
Also, check j4 and j6 connections in the back box.
I do feel bad about this issue.
#9 is the lower pf kicker I believe.
Silly question, on ball one when you plunge it, does the rollover light at the top go out when the ball goes through? BH acts goofy if it doesn't see one of those 3 switches hit first.