Over 100 years I would expect 2 failures to overlap multiple times especially if you are willing to let one slide.. I'd have to assume they were getting paged w

Over 100 years I would expect 2 failures to overlap multiple times especially if you are willing to let one slide.. I'd have to assume they were getting paged when it failed and they failed to set a new bound to resume paging for a worse failure. Anything else could have been their second failure that caused an unacceptable temperature change instead of a cleaner misreading a breaker panel that apparently only needed one failure per 25 years. Not the most scientific cleaners meet not the sharpest planners.