Goldenrivett
I am not convinced by your explanation because this message doesn't appear on all EFATOs or on later version SIMs like 1.7 or 1.8 std. It may be just erroneous linking of the message.The cross bleed message comes as "if performance permits Cross bleed open". This has different purpose. When you loose an engine that side bleed is lost and that also leads to that side pack closure. Now you are in single bleed single pack operation. Should that pack have a problem the pressurisation is lost. So by opening the cross bleed you have single bleed two pack operation. So as long as the bleed is OK you have at least one pack. Cross bleed open message come only if there is no damage.