kcspaguy

One slight correction, power across a wire WITH resistance causes heat.

All I can add is that indeed it is a pain in the butt to strip all the foam to find a leak and if you think you found the leak and refill the spa without stripping it all out, you are likely to get an unwelcome surprise when you find there are other leaks that weren't apparent because they were still foamed over when you had the tub up on it's side empty.

You should be able to just remove the screws retaining the unit to the cabinet, then remove the end of the hose where it attaches to the the plumbing. You may need to twist this as you pull it off. It is just a friction fit over what is known as a "nipple" or "barbed fitting". Before removing the hose, you will want to go to your local hardware or auto parts store and get a "vacuum cap" of the proper size and a small tube of silicone sealer. Hope this helps.