Just be very careful of going in any of the service menus with the can service key!
At least read the manual first to find out exactly what each service function will do to the truck BEFORE you select it!

The RRE has many built in helpful service function's to aid the technican looking after it.

Also read the section on the hydraulic quick connectors & how to depressurise the hydraulic system via the service menu.
Refit the quick connector red security clip in the wrong sequence will result in the hose then blowing out the fitting when it's pressurised up!