bubbles coming from return jet

Generally on an AG pool, that is either a restriction in the line from the skimmer, a low water level or a sticking weir.
 
Bubbles in the pump basket means you have a suction side leak somewhere.
Common places are the pump basket lid o-ring. Clean and lube it well.
Skimmer weir sticking. Make sure it's in place and working freely.
Pump drain plug. Remove and reseal it.
Low water level in the pool. Check the skimmer and see if it's creating a vortex when the pump is running. Make sure the water level is 3/4ths up on the skimmer.
 
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