The keys 9,o,l and . on the keyboard of my MacBook Air have stopped functioning all of a sudden. Instead of the intended characters, random characters from the same row as the faulty keys appear.
Also, the built-in mic is failing.
What could be the problem?
EDIT: The keyboard and mic problem started to appear after a defective screen panel was replaced a few days ago. I wonder how that could have caused the side effects I'm experiencing.