It seams I have some good and some bad news. The servo motor appears to be working fine. The bad news is there are two transistors (I think) that are burnt. I have emailed some pictures to you. If it is just a case of replacing these than I am confident I can do the job. So I can get the Transistors in advance can you identify them for me? Also are these normally the ones that burn from faulty RC valve adjustment? If not is it possible to tell what caused the problem to start with. Is there anything else I should know with regards to changing the Transistors before I start?