Oil leak from bottom of IP, '93 W124 300D

[i-osprey]

Now that I have cleaned up my fuel leaks from the IP and stop lever I have noticed that the black stuff on the bottom of the IP is still there.

I have cleaned the IP off several times while hunting down leaks and preparing it for the O-ring and pressure valve seal replacements so the oil on the bottom is an oil leak for sure.

Could I just tighten the bolts on the bottom or is it realistic for me to be able to remove the bottom plate and replace the gasket(assuming there is one there)?

I don't know anything about the IP internals so I definitely won't be taking it apart until I know for sure.

I guess the oil could be coming from somewhere else but it definitely looks like the oil is seeping "up" from the bottom plate of the IP.