Other day the air suspension light came on. I didn't notice any change in the handling or suspension. The roads here in Maine are pretty beat up. I removed the rear fuses and replaced; no blown. Things seemed ok, than the light came on again. It comes on after driving for a short distance; 1/4 mile.
I have had no known issues with the system ever. Where should I start looking to diagnose? Thanks in advance.

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X5 3.0 AUTO -2001 - 238,000 miles