Some leaks may occur around fittings in a hot tub as

Some times water leaking from the seal in the pump is hard to find. It is usually identified by a drip directly under the pump housing. If that fails and it seems water is leaking from somewhere else, take a very bright flashlight and shine it on the back side of the pump housing where [...]

Buried under foam and insulation is still not a problem. “Dry” is the keyword hear when it comes to sealing up leaks with minimal effort. If temperatures are below freezing you will have to work quick to prevent water from freezing in the lines and pump.
Locate the leak while the tub is running which may [...]