What if it's a small leak and at idle thrust isn't enough to fed, or start, a fire? What if advancing the throttle puts enough fuel through to feed the fire and you think it's just a bleed leak???
Shut it down.
Let the investigators on the ground figure out if this is an "unstandard"(?) situation.
Please don't go making stuff up unless it's really, really, really, really, non standard ops or something that's way outside of expected ops (KSUX DC-10, Scully/Hudson, Delta KSAN L1011 stab failure, 757 dual deep idle stall, etc, etc).
Oh, the DC-10 in KSUX had redundant hydraulic systems. Redundant, just like the dual fire loops.
