Thankfully no damage, just surface rust/discoloration. After taking this photo I degreased and cleaned the entire BB, then applied a smooth layer of anti-seize to treat the area and the threads, making future removal easier and minimizing the chances of rust.

New sealed unit installed and torqued

The old, original BB

Crank (right) side cover before removal

Wrong tool in this pic, but this was prior to removing the old BB.

Yikes, no grease anywhere

Surprised the bearings aren't loose given the condition

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