Parabellum: If you would having an engine separating your airplaine, and like you said, at altitude, I still do not think a bleed leak would be your primary concern
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Next time in the SIM get the instructor to set it all up, give an engine separation and you then ignore the bleed leak until you have done those items you consider more important. (Which are?).
I'm not making this up, it is what I was taught along with many others, if you don't agree go talk to Boeing!
Framer: Yes, I didn't realise the modern 737 didn't have EICAS, but watch out for a bleed duct leak, nevertheless.