Hi again Cecco,
Just wanted to confirm that I was told about the engine corrosion problem by a couple of experienced, well-regarded mechanics who are both qualified on the CJ series and the Williams engine.
Coincidentally, at the time they were telling me this, a CJ had been left on the ground for about 4-6 weeks in a coastal location. The engines were started supposedly without checking for free rotation and apparently a hot start resulted.
So I think this is a serious problem which needs to be more widely known. Anyone from Williams care to comment?