I have an indoor whirlpool tub, and it appears to be leaking from the bottom of the heating box, only when the jets are turned on. Any ideas what this might be and if there might be an easy fix? You can see the water dripping from the bottom of the black box in the photo below. I was thinking of taking the panel off the box to investigate more but am somewhat inexperienced so thought I’d ask for a basic idea of what it might be. Thank you!