Thanks Seagul 1
I got the order of lights wrong (forgot about the scavange pump circuit) I've seen this 'occur'before,but it was a long,long time ago and on the 737-200(showing my age)and the culprit was (according to Boeing)Baffle plates and vent valves !!
I can't find my diary's so cannot give you the Advisory Notice but think it was 83/84.
Again thank you !!
