Discoloration normal?

There was some slight discoloration present where the main disconnect attached to the bus bar. This honestly didn’t seem like a concern but at the same time could not confirm exactly what it was(maybe something from the factory??) Would anyone be able to help or have a recommendation on this?

Can’t see what you see as your light/flash has washed out the color.
Have the Sparky evaluate when he/she is there correcting the double lugged Neutral situation!
Kinda looks like the panel is time for an upgrade (overcrowded?) anyway.

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It’s likely not an issue but as Jeffery suggested have the sparky look at when he’s fixing the other issues. I’ve seen discoloration before that was not indicative of a problem.

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