KC in TX

We have a 2007 Solana 2 person hot tub and the display shows the two rows of _._._._ we checked the manual for a motor diagram and there is no diagram to show where the pressure switch is supposed to be. We opened up the panel to look for this pressure switch and did not find one. No one has had to work on this, we purchased it straight from a hot tub dealer so there is no chance of someone removing it. This is a 2007, does anyone know where this pressure switch would be located?