There is a guy in Oak Ridge, Tenn. George Murphy he wrote the best article in The Star on servo repair. He currently repairs and guaranties for a year. After that 95$ to rerepair his work if something goes wrong 865-482-9175 or perfanalysis@comcast.net. The servo is a bugger, but most people do not maintain their coolant -every two years power flush and replace coolant -otherwise junk wrecks the servo. I have a 300SD and have driven 24 years.