Greetings and Welcome
Sorry about your problems, at least you haven't left the lot.
When you do the next appointment they have will be mid Sept and they'll keep it a minimum of 2 weeks
If you can figure out a way to
diplomatically
ask them if they've checked the manifold valves to make sure they are
all properly seated.
Here's a link to lippert where you can download the manual for your system.
https://support.lci1.com/documentation/
Good luck and keep us updated