Just had a new Pentair VS 2.7 hp pump installed. Started noticing small air bubbles from return jets closest to pool pump, not a whole lot but enough to bother me. Had installer come back out, re-lubed lid o ring, pump drain o ring, opened, inspected union to pump, poured water over every connection to pump, etc, etc. Skimmer level good, weir door good, only couple small bubbles visible in pump housing cover. I then replaced and lubed new o rings in the two older Pentair valves which provide suction to the pump. Lot less bubbles now but I notice when I turn the handles, the bubbles will increase or decrease. Right now it is set to full open from skimmer and main drain and one or two small bubbles will come out of return nearest to pump every five seconds or so. Should I be ok with that? Pump running low speed 1800rpm 8-10 am and 4-6 pm and high speed 2400rpm 10-4 pm. Suction lines from ground up to valve are 1 1/2” and then go to 2” or so to pump. Is it possible the diverter handle or top cover has become weak or compromised and should be replaced as it it probably several years old. Not a SWG pool. Thx in advance for any suggestions.