I was having some serious power problems and noise coming from my left hydro pump. I pulled it apart and found some metal flake in the oil that had caused a few pistons to bind. I looked to see where the flake was coming from and didn't see much. Put it back together and ran like new. With another 15hrs on it the noise briefly came back yesterday. My questions, How much is a new pump? and are there rebuilt kits avail. for these hydro pumps?