Thanks all,
The update now, is that I can't get it started at all today. I've tried on the battery, on external power and using both together, but I can't get sufficient N1 to fire the engine. On two attempts I have had to abort in order to avoid a hot start.
I've now asked my maintenance organisation to read through this thread and we're going to explore the ideas tomorrow. I will keep you all posted and really appreciate the suggestions.
Joel
