Mark

I have seen the same thing happen on a few engines and the last one only a couple of weeks ago and if the cause is the same then it is simply fixed.

Can you flick the turbine wheel and have a look what the lowest RPM reading you can get? It should read right down to 200rpm. If it does not then you may need to take the FOD guard off and simply rub a magnet around the inlet area. You should then find it does read down to 200. I can't tell why this works but it just does. My guess is the engine will run once thats done.

Jason