Dirty or burned?

What do you think?


Normal discoloration, that occurred during the manufacturing process. . .


Main breaker mysteriously shut off during the inspection.
There was one light on in the whole place until it shut down.

I would not look twice at the discoloration on the bus bar. But I would be very concerned about a mysteriously popping main breaker. Defer it to a licensed electrician. Don’t try to re-set it.