Is there hope for this HP 41C?

[Dave Frederickson]

If that's the only corrosion then it looks like all you need is a golden zebra and an Expansion Port block.
HP Calculator Parts and Services can be found at the top of the Articles Forum, here.
https://www.hpmuseum.org/forum/thread-10769.html

But you'll probably want to start out at The Calculator Store.
https://www.thecalculatorstore.com/epage...P41_corner