Left bumper just broke on my Elite Controller while playing Just Cause 3, it still works but the actual button will pop out if it's turned upside down : r/xboxone
Xbox one controller left bumper button not working - lets fix it! - YouTube
How to Fix Xbox One Bumper Buttons (LB, RB) Replacing Tactile Switches - YouTube
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XBOX ONE ELITE CONTROLLER MAIL IN REPAIR - UBER MICRO REPAIRS
Xbox One controller bumper button fix| LB/RB switches not registering? - YouTube
Xbox One pad's L/R bumpers becoming unresponsive? Probably just needs a spritz of contact cleaner. | Shacknews