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Update, April 29: Small leak noticed, water level 2" down (I don't check water level every day). So I removed the filter and added more "Fix a Leak". Well, the marine epoxy was a good try, spa is 36 years old.....the epoxy looks like it's still holding....

Fixed... everything works now. The FL1 was a problem of my own making - when I originally opened the tub a couple of months ago i was so angry with the leaking flow switch that was "professionally" repaired that i tightened it by hand 1/4 turn and screwed the direction of the flapper thingy. I figured this out even before opening the hot tub, I remembered that episode when i went to pick up some plumber tape to redo the switch. The "professionals" had used just a couple of turns of thin tape and it was not working...(random thought - HF has MUCH better tape than HD, it is much thicker). So I removed the flow switch, re-taped it and put it back on, pointing in the correct direction. FL1 is gone, heater working, etc. I will let it run for 48 hrs and then do a deep clean with Ahhsome and replace the water. CanadianSpaTech - I cannot thank you enough for your help and advice... I really appreciate it!

Thank you for the great trouble shooting guidance. I will do that over the weekend. The circ pump seems to be working and I suspect it is the flow switch but will see how it turns out... Thanks!

Partial progress... replaced the terminal block, snubber and the burned wires today and fired it up. The display turned on, both pumps work... Thank you CanadianSpaTech for your help to get me running again! Now, the partial part - I have a FL1 error on the display and the heater does not turn on. All I had time to do was clean the filter, which did not help... will do some more trouble shooting and will try to purge air over the weekend. I only know FL1 is switch stuck open or dirty filter/air pocket so need to research a little more.

I figured out the issue!! The red wire from the flow sensor had gotten slightly pulled out of the sensor bar on the control panel. After resetting it to where it is making contact with the pin, the tub is now heating and throwing only the cool code (water temp is 56°). Thank you for the help.