Having that done now to the tune of about $2,000. I'd do it myself but I had bypass surgery a while back and that's a bit out of my capability for now.
I had mine rebuilt twice. The first was at the factory along with other repairs. It has to be a common problem because I had to show the supervisor every problem except the bedroom slide. He said he didn't need to see it because he knew what the problem was. About four or five months later I discovered it was leaking again. After probably six months of back and forth the company approved my dealer to rebuild the slide again. I don't know how it held up because I sold the unit after that.