L322 Air Susp Inactive

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As @Mark Piercy says abs maybe causing issues on the can bus that may effect other ECU's. I take it you've cleared the errors using the diag tool but they come back?

BTW I'm far from being an expert so just throwing things out there from personnal experience.
Yes I’ve tried clearing them many times. CAN bus lines are ok from Control Module to the compressor but not sure if the control module might have died from it sitting around for a while?
 
The air suspension is in a soft fault, if it was a hard fault everything on the height selector would be blank..

Your issue is ABS related..

These are the faults in ABS
 

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Don't forget the suspension along with other Ecu's use the abs sensors also as speed sensors for suspension heights at speed and vehicle speed in some cases.
Start with the fluid issue first, you can check the abs sensor via live data and see if they respond while taking a slow speed drive. This may not be your problem but you can varify that. ;)
Check for voltage at the ecu and check for corrosion on the pins.
 
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