Low air pressure while driving on freeway!?

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{"text":"So, one of my air gauges went under 75 psi and a red light and audible warning signal came on. I stopped, waited for the air to build up, checked for air leaks, but nothing. Could it be my air compressor is malfunctioning? This is on a 2014 Freightliner Cascadia with a DD15.","pics":"[]","canComment":true}