leaking black water valve

Steady leak from the black watetr tank because the valve is partially open

Both valves appear to be closed.  However the cable between handle and valve is disconnected.

My other 5th wheels have used threaded rod to connect the valve to the handle.
The Hitch Hiker uses cable which has become disconnected.

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There are at least 32 small hex head screws to be removed to drop the belly pan before I can even see where the cable is disconnected and why.  The pan is also at least partial sealed with some type of caulking compound.  I'm really not looking forward to working in these tight quarters.  I'll keep you posted.