skyhighfallguy:
I can imagine that a duct leak in the nacelle could have triggered the fire alarm, and that upon reducing power the warning went out. While I have not flown this engine, it seems to work that way in other jet engines.
Compressor bleed air - regardless of the engine nameplate - will be hot enough to set off a fire warning. Hardly a desirable warning system, but so far, none better has been devised.
