Air Suspension Issues Left Side?

[MW3Designs]

Ok, I’ve been reading forums, troubleshooting the issue, but am still having the issue. Have owned many BMW, and picked up a used 07 X5 a few months ago. When I first drove it I got the ride height error messsge. Visually noticing that the left side was lower than the right, I assumed it was the air bag. Code for the EHC was “control time lifting rear left”. I bought a new set of airbags, and started on the Left side. Once the wheel was removed I noticed a repair job on the ride height sensor wires, and that the wire was broken. I fixed the wire properly, and when I put the car back on the ground the pump kicked on, and I realized I never heard it running until now. Cleared the codes, and drove ok for a couple days, then the error came back same as before. I replaced the bags, drove it for a day, and error code came back. Still only the left side, even if I activate the system in diagnostics to fill the rear left it doesn’t fill to the height of the right side.

Could it be possible the pump can’t compress the air enough to fill it? I hate to throw more parts at it if someone’s been here before.... Any ideas?