[360]

So I drop by storage unit to pick up a few things and before leaving I hear the most strange sound coming from the bay in between my engine and the house batteries on the curb side.  I believe this houses the air system for rear slides?  It's a repetitive sound over and over again and if you expel air from the top desiccant it will stop for a second and then keep right on making the same repetitive sound.  I think the link posted will take you to YouTube where I uploaded it.

I got out my bubble and my Amprobe and the Amprobe per the attached pick gets a 99 on that black knob, but I have zero air leaking there.  Assuming that means the sound is resonating from that knob?  Where I was able to see signifiant leak is in the seam on the little metal rectangular piece at the bottom.  I've circled that in red where it's leaking and also one with bubbles as it's leaking quite a bit.  Not sure if that needs to be replaced or if it can be taken apart and have some type of seal replaced.  Not exactly sure how it even comes off the wall?

Hopefully this is not clear as mud.  I guess the good news is that I found a pretty good sized leak along with one push fitting that needs changed to compression, but otherwise I'm at a loss as to what this sound is and how to fix that box from leaking.

https://youtube.com/shorts/QZwxTDf-sSU?feature=share