On the Gio @5 the screen tilt button is not working even when fully depressed. How do I fix this?

This issue displayed itself recently and suddenly. We have had no issues with it for several years, but when it stopped working it stopped on both of our consoles in the same day...very odd. We don't adjust the tilt often but when we do it is for transport. We are quickly approaching a time that we will need to transport the console so it would be nice to get resolution.

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