I agree , I have followed this case with much interest. The servo valves did not cause the problem because historically , the cases of rudder hardover on the Boeing 737 have always happened when the aircraft have descended from high altitude, where the temperatures are well below zero, to low altitude where the temperatures are much higher. In addition , the manoeuvres the Silk Air aircraft went through did not match the flight parameters of previous hard over cases. The action of the pilot speaks for itself. What is sad is that the truth will never come out because it was a case of cover up by vested interests and also a case of making big money for a few others.
