Chris,
Having the black tank leak to the ground will get you into a lot of trouble in some places.
I do not know your coach at all, so I am going to offer some generalities that I hope will help.
In coaches where they could, the pipe from the toilet drops straight into the black tank.
Most toilets mount on a plastic closet flange. That flange (Look it up in at a big box) mounts the pot with a couple of hard to get to fasteners. You will have to look that up for your toilet. The drop pipe is only a slip fit to the bottom of the toilet. There is a foam rubber seal that is the equivalent of wax ring used in houses. When the pot is out, get the screws out of the closet flange. Now you have a chance. Try to pull up the closet flange and drop pipe. It is either screwed into the top of the tank (rare in this new a build) or it was pushed into a rubber grommet like that at the left edge of
Parts catalog this page.
If it is, the grommet may have been dislodged or damaged. You may be able to reseat it or replace it and shove the drop pipe back in. You may be able to do this through the opening in the floor when the drop pipe is removed. Remember Thor had to assemble this the first time and they would not have done it the hard way.
If it is like many older builds, and the drop pipe is threaded into the top of the tank, the tank will have to come down and be repaired. If that is the case, get back to me for more information about repairing black tanks. There are a lot of things that won't work.
Best of luck and tell us what you find.
Matt
