?got codes? ?got access through dash to clear codes?
if not, you will need to have your local Hyster tech come out and hook up to the truck, Hyster is very closed about the software, and expires everyone of their techs software a couple of times a year. However, if the Hyster tech will set the pass-code and let you know the numbers, you can do 99% of everything the laptop can do, through the dash.
What motivated you to replace the EPR? Those do have a kit to replace the diaphragms and springs if needed. (or so I hear)