This is a great mower, (with a 22 hp Yanmar diesel,) in excellent shape, but developed a massive leak in the hydraulic steering control valve where the shaft enters. The valve is all steel, about 3"x3"x4 1/2", with 5 hoses coming out the bottom, and an 18" shaft going up to the steering wheel. I found one on EBay that looks the same except the shaft is much shorter; the seller calls it a Sunstar Agco valve. Does anyone know of a repair business, or a place that still makes these? The seal is not accessible, and the valve will not disassemble - it's like it is a solid steel block. The parts book shows two different numbers, both No Longer Available. Any leads would be most appreciated. Jerry, Cashmere, Washington.