As a followup to my initial post. Found the leak after removing sufficient foam to fit my shoulders into and under the spa filter section.
The leak is in the 3/4" bull of a PVC 11/2" Tee. The T feeds 1 of 2 large volume jets which form a whirlpool effect.
The bull of the T is a hose feeding to a spinning jet.
The repair appears straight forward.
Cut 3/4" hose.
Ream the leaky section of hose out of the T.
Cement clean hose into the T
Couple the cut hose as there is insuffucuent slack to pull 3/4" as I do not want to remove more insulating foam.
Wait 24 hours, fill tub, check for leaks.
BTW - I drained the tub Aug 23 (Aug 21 began removing foam.) With work, vacations and family I got to finish removing foam Oct 5. I was suprised how soggy wet a few pockets of foan still were.
So if I had a vote I would build a spa with layers of insulation at the perimeter and finish off with Reflectix or similiar boundry.
Now it's time to measure up the exterior to install new siding, i.e. Texture T1-11 or similiar.