Help...

I've just swapped out both front airbags and struts due to a right front rupture (1 cm tear).
I did this in a nice toasty workshop, and the car was fine when driving back home.
The morning after though I had all sorts of error codes popping, mainly related to height sensors, pressure build up and non build up here and there, and most importantly a super saggy front end.
I had the battery checked and health was fine, allthough at 50% charge.
Charged it up over the weekend and started fettling again with the car today.
The front bags are completely empty, and when I took of the inner wheel arch to access the front valve I found absolutely no pressure from the inlet hose to the valve (unscrewed it from the valve block).
I've uncovered the air compressor in the spare tire well, and there are three air lines going to.. somewhere.
Two green ones and one black.
I assued the black one goes to the front valve, and the two green ones to the rear valve and reservoir?
The black one has plenty of pressure when easing off the Vossen fitting.
Any suggestions?
We have -10 around here now, so maybe som moisture could've entered the line at some point?

Did some quick youtube searches now, and it seems the black line actually goes to the reservoir.
So somewhere along the car my black (front line) changes to a green one at the back in the compressor valve.
Any suggestions?