Morning, Lexus RX 300 on 05 plate. Air suspension. { recently had front N,S suspension unit replaced ( leak on old one) Suspension refuses to operate to come up and consequently bouncing down road. Have had air compressor changed, whole system air and smoke tested, all lights on dash working yet no response from sus.Is there a particular sequence that should be followed to correct this for re-set. Pressure on compressor producing app 75psi