2020-2021 New Freightliner Cascadia (Park Brake Air Low Brake May Drag) Buzzer or Beeping Noise

Air tanks full and a message comes out on dash after release a parking brake telling you that brakes are low on air pressure , beeping noise also . This is a failure sensor under dash on driver side . Sensor is marked blue . Behind accelerator pedal . Plastics needs to be removed in order to access to sensor.