I have learned that equipment that is not required to be protected by a GFI is not required to be free of ground faults. CSA told me to remove the GFI from steam tub equipment that was tripping the GFI. If the UL test is the same as CSA, it is a power off test. Anything that causes a fault after the equipment is energized is not noticed. I suppose that, since there are no other prescribed tests, they can't or won't change the standard for one piece of equipment regardless of the circumstances. Knowing this, I would also run a new circuit.
