My Flying Spur has a suspension warning, where do I even take it?

The air suspension warning came up on my Flying Spur last week and since then the ride height is all over the place, sometimes it sits low on one corner and other times it's fine. I know these systems are complex and the last thing I want is someone poking around who's never touched a Bentley before. The dealer is an option but the last visit took nearly a week and the bill was eye watering, so I'm weighing up independents. A contact in a owners group mentioned a reliable Bentley repair center in Musaffah Industrial Area and said they handled his Continental's suspension without drama, but I want more reassurance before I commit. Specifically, I'd like to know if they have the diagnostic software to read the suspension module properly and whether they use genuine or OEM parts for the struts and compressor. Has anyone here had air suspension work done on a Bentley outside the dealer and did it actually last? Also, is driving it in the meantime risky or am I asking for a bigger bill?