Bubble in Return Lines

Folks,
I was having a small trickle of bubbles in my spa return. Over the last month, it has gotten worse and started to come out of one return in pool as well. Today I changed out the o ring on the pump lid and it made no difference at all. What is my next "easy" step before i have to call out the professionals. Thanks in advance.
 
Show us pictures of your equipment pad so we can see what may be causing the suction side air leak…

 
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