I agree with e30cabrio, diagnose the faults with DIS first, there are tell tale fault codes showing the compressor out of spec and needing the rebuild kit.

Also I don't have a facelift but from what I know about the dsc light coming on with self level inactive, it could be a transfer case actuator motor fault.

Regardless, your air struts should hold air whether the compressor is running or not (air is stored in the air tank), so if you are losing air overnight on one side you might be leaking and needing Arnott replacement air struts.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards