Welcome to the wonderful world of RV ownership! First trip out with our new Terry and I was so excited to have a new factory-installed black tank flush. I got to the dump station, connected the hose and proceeded to flush. Within a minute there was water pouring out of the back of the TT! What the #$%^&*??
Went inside and one of the elbows that connected to the pex coming from the flush connection was missing a crimp ring and the connection blew apart as soon as I connected the hose! Fortunately, this was right inside the back wall, under a cabinet where the HW heater is. Vinyl on the floor and all the water drained out.
All you can do is dry it out and hope for the best. Keep an eye on it down the road for any signs of mold, etc.