Bleed air leaks can be trouble
"lomapaseo Most engine true fire warnings are not fuel fed combustions but rather hot air leaks from bleeds etc. Thus pulling a engine back to idle may be enough to silence the alarm. "
Bleed air leaks can be trouble.
There was an event where a 13th stage bleed air leak had hot air flowing over an area where fuel vapors were possible ( I cannot recall if it was a pump housing). Because of the way the leak flowed, there was no fire indication, only erratic changes in N1. Idle brought all indications back to near-normal, but a fast return to the departure airport (from 40 nm out to sea) was accomplished. When the mechanic opened the cowl, the look on his face was memorable, as he pointed out the possibility of fuel vapor ignition. It would have been better to shut it down in-flight, but there were no indications to lead us that way.