I want to know what do you think?
What was probable cause?
Before that, for last 2-ish years I must replaced 5 LED bulbs.
No other symptoms.
Right before failure, one or two LED bulbs started blinking.
I heard "scorching" sound.
And smell of burned electric/electronic (isolation).
Then I disconnected all circuits and opened all surrounding boxes...
Over-current breakers or RCD/GFCI didn't tripped.
Extra photos:
(ignore temporary jumper - fixed now)
There are remnants of a ferrule on the other end.
Yeah.