CP-31 operations manual, service parts exploded diagram, and editted sections of the CP-51 manual were all located in thier binder. Finding the binder took a bit of time. I copied it on Saturday and posted it then as well. It should get picked up this afternoon, and might get to you by the end of the week.
The CP51 stuff gives better advice on maintaining the machines; the cp31 is a smaller machine, and has analog temperture control on tanks two and three, while I think cp51 is just a bigger brother with all digital temp control.
If anyone has circuit board schematics, they would be handy. I have yet to figure out what the t1/t2 switch in the W/D module does; there seems to also be a handful of chips that output to a multi pinned plug that connects to nothing in my cp31 wash dry module.