2017 Volvo Vnl 670 Transmission Issues

I’m having issues with mines. I’ll start it and it’s a gamble if it lets me rev for rpms or not. Then to get clutch to engage I have to put it in gear release emergency air and wait for air to build up to 10” psi on its own then hit parking release because if I hit the brakes all the air will drain too fast and I’m stuck with a limp truck. Then it’s another gamble if it lets me shift, sometimes it’s the first gear sometimes it’s a few gears but no shift after and sometimes it’s like “ hey, I’m gonna #### with this guy” and it goes back to normal and everytime I’m like WTF trying to figure it out. When I try to reverse and back to the left it dies, air goes out and I have to retry all over again. When going up inclines it’ll die sometimes. I figured it has to be an air leak I been all over there and replaced almost everything I could so now I’m stomped any suggestions?

 

So far to get it to move I had to stop the truck out it in the gear I want and apply just the parking brake but release emergency brake. Let air build up to 100 psi or until gov cut off on its own then release parking brake and clutch engages