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Changes to Step #9

Edit by Sarah Pierce

Edit approved by Sarah Pierce

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[title] Clean Contacts
[* black] Use the screwdriver (or a small wire brush) to gently scrape away the corrosion on the contact pads.
[* black] ''Be sure not to damage any of the traces or other parts.''
[* black] ''It is probably best to clean them all, but if you just have one key giving you problems, you can concentrate on that one.''
+[* black] ''If the contacts on the back of the button membrane seem dirty, you can also clean them.''