The RV toilet in my 1989 Born Free 26 foot Rear Side Bed was not working properly.  The water would not stay in the bowl when I filled it, it would just drip down.  The water is supposed to stay there to keep the odors in the black tank.  Many people have said the culprit is usually toilet paper that gets stuck in the blade.  It turns out TP was the problem, but I figured I since it was apart and the seals were 24 years old, I would still replace the seals....$50.

Here is a video of my repair.