I have a 2013 E550. It was driven too long on a faulty strut that didn't hold air. I replaced the strut but the rest of the airbags aren't filling. I replaced the compressor but it still won't rise. I hear the compressor kick on but then it releases air and shuts off. It does this a few times and stops. Is there anything else that this could be besides the valve selanoid? TIA!!