I googled my model and found this one:
https://www.centralstatesbus.com/199...97/1919331.pdf
Try calling your local BB dealer. They may be willing to help.
Or, your local district's mechanics.
I just walked in cold one day, told them what I was doing, and now have one of their techs cell numbers. He actually came with me to check out my most recent purchase and give it a once over.
It's amazing how friendly the bus community can be!