Actually, thinking about it a little more, is it convenient enough that you can get your hands in there to work, or is it tough to get to? The leak is probably at the sensor or the hose. If it's close enough to work on, maybe see if you can remove the sensor and take a look at what you see. Maybe cleaning the sensor seating area and plugging the hole (with like wood dowel or cone-shaped piece of plastic), add some water back in and see if it still leaks. Or, maybe cut the hose connection and see if you can carefully slit the piece of hose on the barbed part of the jet and get it off. You might need to heat it up with a heat gun since it's cold outside. It depends on the type of cement they used. You might not be able to get that piece off. But if you can, clean it, apply more sealer adhesive/cement and put the hose back on. Use a hose clamp too. Then add water and see if that stopped the leak.