Here's a link to the Lippert Master Owner's Manual (Leveling and Stabilizing):
https://support.lci1.com/master-owners-manual-towing
Then I think what you want is the section on page 41 titled Ground Control TT Leveling System.
You may already know all this, so this is just an FYI.
Good luck on getting it all working. By the way, I've had very few issues with Ground Control 3.0 on my trailer and learned to work around them so the operation is now flawless. I'm very happy to have it.