Good guy Valve is taking another step forward in keeping your Steam Deck as operational as possible! Announced today from the official Steam Deck Twitter account, Valve has officially opened up Steam Deck repair centers to specifically repair your Deck:
If covered under the warranty, which is a standard 12-month limited warranty, you can send the device to one of the repair centers free of charge! You can still send your Deck to the center if you are out of warranty, but they may charge a fee. They will ask before charging though and, if not wanted, they can send the device right back to you. You can also try to fix it yourself by ordering appropriate parts from iFixit.
Valve also posted this on Steam, as well as provided a few scenarios where a repair center may be a good idea!