Update:
I wasn't able to find a service manual, but I did find a parts list! The output board and wire harnesses were all the same. The only thing different was the control board. I found a new 9 series control board on eBay and installed it. It worked! Having 3 kids, the soak feature and longer wash times come in handy. I used to have to pause my 8 series to soak and after it filled, reset it to get longer wash times. This makes it much easier on me. Anyway, I just wanted to throw this update out there for anyone that bought a 2017 Speed Queen in 2018, but wanted a 9 series and couldn't find one.