Frage Service menu

In my 2017 Columbus you can access what I think is a service menu by pressing both arrows and the circular button together.   Can anyone give me advice about what the numbers represent and what the user can safely do? 

Hi David,
you can find settings for the service menu  here . You might also want to sign up at "kastenwagenforum.de" which has a thread "Heizsystem Westfalia Columbus" with more than 800 posts covering the Columbus Diesel / water heating system.
Cheers,
Stefan

Hi Stefan - thank you again.  I did join that forum and was amazed that there seems to be so much information.  Should I post my experiences with the new lithium battery being fitted in 8 days?  David