Possibly a leaking rear bag, the system won't be able to pump up if the leak is severe, are the 3 lights in the switches flashing or all on?
Other things that can cause it; any of the rear height sensors, alternator failure/ fault, compressor/ thermal switch fault, valve block leaks, Much as I like this system, Nhulunbuy isn't a great place to be with an EAS fault
JC


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