Pull your access panel, run the water, pump off, and visually inspect for leaking, if you see no leaks turn the pump on and inspect again, you should be able to find the leak visually you may need an inspection mirror for the hard to see areas. Once you determine what is leaking then we can talk repair.
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Ok, I did some more debugging.....and I found the source of the leak, it is a half ball valve (plastic half ball, o rings) with what looks like a solenoid attached. the valve is at the end of a pvc pipe that angles down, and I am guessing is related to the drain over flow. There is no other plumbing attached beyond the valve/solenoid...it terminates the pipe. The tub it self is a jacuzzi J-Sha.