Ok, I have isolated the problem (from what I learned from this website yesterday) to what I believe is the heater. I have a couple pictures of it. I have disconnected the two wires that connect the the (heater?) tube and the unit has stopped tripping the GFCI breaker. I assume that these wires are for the heating element and that the round component to the left of it is a solenoid valve??
I disconnected the red and black wires at the bottom right of this picture.
For this problem, will the heater always need to be replaced or are there some instances when it doesn't need to be replaced?
Unfortunately, the spa is 5 years and 2 weeks old and I think the warranty is for 5 years. Boy, those actuaries really do their job right when they calculate how long to have the warranty.
Also shown is a picture of the tube with model number. Do you carry this brand?
P.S. EXCELLANT work on the great advice here!! It really blew me away to have such detailed and competant advice!