Update
Updating database... Please wait.
Sunday 4 March 2018 at 03:36
Documenting my fix should someone else run into this thread with the same issue.
I noticed that the drive connection for the backbox flipper was J117. Examining the board, there was nothing plugged in. I didn't see anything else being driven from that connector (only VIO-BLK in J117-3) and I saw a s...
Source: http://pinside.com/pinball/forum/topic/nba-fastbreak-two-coils-fire-at-once-one-rightone-wrong#post-4261969