After establishing there was no power feed to the servo i tracked down and tried new RC control units (both the one under the seat and one behind rh rear panel). Now the servo turns to the left but not back again and obviously has some some kind of electrical fault! The bizarre thing is that it moves now when i plug my old units back in???? I havnt got time to mess around anymore as im overseas for a couple of month from next week so have asked the mechanic to set them half way so i can at least have a ride before i go. Anyone shed any light? Cheers