while using the pressure washer water stopped coming out of nozzle. I checked the unit and found that the bottom half of the pump had separated from the top half. Three of the allen screws were sheared in half. The roller bearing cage was missing several roller bearings. The large washer which the roller bearing cage sits on had stipple marks on it. Apparrently the pump has to be replaced could you tell me if a replacement pump is available and what the cost of the pump is.