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I've replaced the heating element and the temperature pressure switch and can only get water up to 77 degrees. Before I swapped out my old temp pressure switch I screwed the top adjustment screw all...

I have an older tub with 4 jets and 2 air intakes.

The intakes have screws tops which I open to allow air

Problem is only 2 of the jets will pull air in to mix with the water

It has nothing...