The problem is you admit neither the remote possibility nor the extreme improbability.
My post #74 "So, the
probability of such an event is
vanishingly small in my experience."
A vanishingly small probability
is an extreme improbability.
I have given my opinion on failure mode with my justification for it based on physics and on experience. I included a picture in support of that opinion.
Here are a couple more pictures* of a fairly big device - I put a ruler next to it for scale.
The interdigitated structure might or might not give you a clue about what this particular device is.
The second picture is a close up of the damage. Once again it clearly shows melting, this time in several places.
Things generally
Now, unless you are going to add something constructive or informative to the thread, I suggest you scuttle off.
*The quality of the pictures. They were taken with a pretty inexpensive digital camera.