I have a '91 500SL losing power steering fluid. The hose from the reservoir to the pump appears moist, but not running wet. The system loses quite a bit fairly quickly. Have there been problems with these pumps? I believe I can get the pump off the car. If it is the pump, is it just a matter of replacing a gasket between the pump body halves? If it is more involved, are there rebuild kits available? Should you take apart a pump at home?