Thought it was a false alarm!!
How do you really know for sure that it's not real?
Just because the floor doesn't get warm or there is no smoke in the cabin or the cargo temps look normal or there are no dangerous goods on the NOTOC doesn't necessarily mean.........
Who knows what's in the pax baggage......
What they should do is install video cameras in the holds that can also see thermal images.
Then you'd have a good idea what was going on.....