The air spring was replaced in 2019 it looks like ( if this is a manufactured date im looking at on the airspring) so I'm thinking that's probably not the problem🤷‍♂️ but not 100%. It holds air but sits lower than the other three wheels. Also when I press the button to raise the car it raises but is still slightly lower than other wheels. Any ideas? Bad valve block maybe? I discounted the level sensor because if I understand correctly. The rear has one level sensor and only one side is effected.

It's possible, that the system just needs to be recalibrated using Star/Xentry Diagnostics computer.