I had lots of air in the system. I could see it in the check valve "window" for the spa return and see the bubbles coming out of the two returns closest to the pump. The PB suspected a faulty check valve on the Ozone system. To confirm this, I removed the ozone line from the pump basket drain and re-installed the drain plug. The system cleared up of air.
PB comes out yesterday an replaces the check valve. Today, lots of air in the pump lid, check valve and in the near returns.
Is this to be expected, or is there something wrong?