Need a little advice for a fix.

I have a Grizzly air lockers installed and I noticed the other day that my front was leaking. Upon inspection, I noticed gear oil seeping from the top of the front diff. It appears to be coming from the bulkhead connector, where my air hose goes in.

I am to assume that I can press down on the air hose, press on the "push to fit" fitting and release the air hose. I assume that I should unscrew the Push to Fit fitting, apply some thread tape and screw it back in.

Here's my question: Does the bottom bulkhead connector (that is screwed onto the diff) hold the inner air hose in place? I'm concerned that if I unscrew the Push to Fit fitting, the inner one air tube will fall into the diff. I would think that the O-ring would keep the inner hose from falling into the diff. Just not sure.

How do I fix this?

 

Maybe take off diff cover to watch the inside line to make sure it doesn't come apart.