Hey all. Been having a lot of air coming out of my return lines. And lots of bubbles in the strainer lid right before pump. I’ve replaced o-rings in strainer lid, drain plugs, new cartridge filters, new o-ring around filter, new clamp. Psi normally runs at 20 but now between 15-17. And still getting air return. Pump is pentair VS about 5 years old. Could pump be going out? Even checked around PVC pipe with soap. And tried dye around the skimmer. Can’t seem to figure out why my pressure is lower than normal after a good cleaning of filters. Even replaces bleeer tube assembly cause the screen mesh was cracked. I did use different filters than normal but was having the issue before repacked filter. What would be next step? Is it possible the pump?