my down button stopped working; sometimes I can get a page to go down and sometimes I can't
On my MacBook Air, the down button stopped working. The up button works. What is the recourse to get this fixed?
MacBook Air 13″, macOS 11.6
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A tiny piece of debris might be causing it. Even though it describes a different model Mac, try cleaning the keyboard as described in How to clean the keyboard of your MacBook Pro - Apple Support.
That Support document was intended to address a specific concern with the type of keys used on those Macs, but the procedure can be applied to any portable Mac.
If you don't succeed, contact Apple to get it fixed. Start here: Get Support