2004 XLT 4X4 165,000 miles

I notice that my transfer case leaks from the bottom. Is there a gasket between the halves that I can replace? I looked in the fordparts diagram and it doesn't look like it.

Any ideas? Just tighten those bolts holding the face on?

I'm taking off the electric motor this weekend and that would be a good time to dig deeper and fix this leak if there's a way.

Thanks