Official or recommended PM procedure?

I am looking for the PM procedure to follow in maintaining this new cell washer (3). The service manual only covers replacement of boards and sensors and calibration afterward.. I do not see any reference to normal PM procedures though. I will look through the operator manual to see if anything is there, but I would not expect this to be in an operator manual. Does anyone else out there have a procedure to follow on these? thanks if anyone knows.. mrstan