With no experience on Gulfstreams, how is an engine fire warning distinguished from a bleed air leak or fire detection loop fault?

I ask because although it's been 20 years since I retired I vividly remember the procedure on the 747 for identifying which problem is setting off the fire warning that must be done before pulling the fire handle, and the highest percentage of problems were bleed air leaks, followed by shorts in the loop, then actual engine fires.

No replies yet, so I would guess the fire detection loop system has a self test feature that prevents a false warning, and the checklist calls for bringing the throttle to idle for a bleed leak check before shut down.

Engine fires on today's pylon-mounted jet engines just aren't the level of threat that the wing mounted radials of old airliners were, or unfortunately the wing mounted turbine and piston engines today.

With todays jets, doing something wrong in response to an engine fire can be a bigger safety threat than the fire itself. Silencing the bell brings down the level of excitement and allows for methodical thought and action. There's no rush.