"I hope you didn't lose any favor with Management."
"Brownie points" are imaginary points you "earn" by doing little favors for someone. For example, if your boss' car has a flat tire and you give him a ride home, you'll hope he'll remember your kindness. Maybe when you need an extra day off, he'll consider that you went out of your way for him, so he'll do this favor for you.
"Top brass" are the executives or highest management of a company.
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