Samsung Washer WA400PJHDWR/AA-0001 Can anyone tell me how freely air should flow through the water level sensor tube at the tub? If I create a vacuum on the tube at the sensor it will fill the drum, if I create pressure it drains, but if I try to do either at the drum the air barely moves back into the drum as if there is blockage. The switch has to be sensitive and not require much pressure difference. The clamps are not that robust