Leak in black tank flange

[Sicko]

I have a crack at my black tank flange. One of the ears is broken where it connects to the pipe that comes out of the tank. My problem is I can't get to it to fix it. It's a 1999 Forest River 303 on a Chevy chassis. Maybe some one can tell me how to get to it.

[SeaDog]

If you can see it why can't you fix it? a pic would be nice. allot of times to fix these items it requires taking more then just the flange (on the black tank) apart but also loosening other flanges (gray water) to allow clearance or dropping coorplast.