filter shooting bubbles

I replaced the part that was cracked....thought I would be home free when I saw the basket fill with water and no air at all. But low and behold the return was still shooting bubbles. I took apart everything. all fittings checked o rings did all the tips and hints to find out where air is getting in. put it all back together and still have bubbles. less bubbles but bubbles. I am not sure what to do next.
 
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