Flying_Tuur, I don't think the Kidde loops can be burned .
You mean melted ? Impossible, I think. Of course they could melt after an hour at those temperatures, but certainly not in 30 seconds!
And even if severed somewhere they will still work (the signal is between the two wires, not between one extremity to the other).
Boeing is considering nowhere such a possibility in the manuals.
No test required after the warning has extinguished.
Of course, very academically, the loop could fail at the worst possible moment, but...
7p3i7lot , somebody in your company must be smarter than Boeing...