In message , Michael
Chare writes
"Graeme" wrote in message
...

To be honest, I'm looking for suggestions I can make to the engineer,
without looking as though I'm trying to teach Grandmother etc.

I would just stick to describing the symptoms!

Wise words :-) Yes, you're right, of course. He is the guy who knows,
and will doubtless not welcome my thoughts.
--
Graeme