EAS repair.
You have a "soft fault" which can be caused by many minor problems. It is a warning, to let you know that a "hard fault" is on it's way.
the soft fault could be caused by a bad sensor (might even be just dirty) a bad pressure switch, or the compressor running too long (to name a few).
unfortunately the only way to find out is with a scan. there might be someone in your area with rovacom/autologic so you don't have to give your first born to the dealer.
There is some basic troubleshooting you can do-
First have a look at the airsprings, if they're dry-rotted and cracked it's time for new ones. That alone might clear the soft fault (soft faults will self clear if the cause goes away)
Listen to your compresor, if it sounds and shakes like an old diesel, it's time for a rebuild and new mounts.
Mix up some soapy water and spray it on the airline connections to the block, and the spring tops-leaks here will give you problems. new orings
will take car of that, sometimes the lines are chewed up by heavy handed mechanics, you can trum .5mm from then end to get a better sealing surface.