Dom, I am very very sorry for the loss of your jet, when I received the call yesterday I actually got a stomach ache!
You have put so must time and effort into these jet to have something like this happen, it is unmanageable.
What I found out back home when I plugged things back in and turned on the radio is that the rudder was locked to the full right position.
One question did you check your servo arm, did it slip on the spline?
What model number of servo was it?