I have a gecko heater in my hot tub and noticed a leak coming from within it. When I opened it up- looks like the leak is through a component that goes into the metal tube. Is it a thermistor and is this a normal failure of one? Should I just buy a new thermistor and replace this one? I don’t think the leak is through the threads but is through the actual part as the drips are collecting at the top where the electrical connection is. Pictures attached. Thanks!