Main Pressure Switch Test or Calibration...

My pump started making noise, then eventually I started getting the "Pump blocked?" message. I drained the water and thoroughly checked for blockages. Even went as far as removing the pump and all hoses from the drum to the drain pipe -- everything was clear. I decided that, due to the excessive noise, I would just go ahead and replace the pump, even though it was pumping out water just fine.

I just finished putting in the new pump. MUCH quieter! But I'm still getting the "Pump blocked?" message. After studying the machine, I'm convinced it's a problem with the main pressure switch (See part #32 on the parts diagram)

It's as if it's not closing the switch (or opening the switch, whichever it's supposed to do) when the water drains, which tells the logic board that the water is drained and it's time to move to the next cycle.

Does anyone have any testing and/or calibration instructions for the main pressure switch?