Hello Patty's husband. She made a reference that you are an engineer. May I ask what kind of engineer? Do you understand what a GFCI breaker does? They measure the balance of the current flow to the load. If the current flowing INTO the load (spa stuff) doesn't match the current flowing OUT OF the load, that means there is a leakage current flowing somewhere. It only takes a few milliamps of leakage current to be fatal.
First of all, I would verify that the GFCI is connected properly. There have been posts mentioning that even licensed electricians have managed to hook the GFCIs correctly. Even if the wires go to the correct terminals, the wires should be clean and the terminals tightened properly.
There are some very helpful and knowledgeable people in this forum, who have given some good advice. There are also some who try to be helpful, but may not make the best suggestions, which could lead to your injury or death. You must choose wisely.
If I was having the GFCI problem, I would start by disconnecting the spa from the GFCI breaker and check for tripping. Next, I would check for wet areas in the equipment bay, damage to wiring, etc. If everything looked OK, I'd start isolating the components in the spa, disconnecting the heater, pumps, etc. one by one. Unless you are an electrical or electronics engineer (I am), at that point I'd recommend bringing in a pro.
If you are an EE, PM me and I will offer some other suggestions.
Regards,
Altazi