2017 Full Set PS4 L1 R1 L2 R2 Trigger Buttons Replacement Buttons for PS4 Game Controller + 2 Springs Joystick Stick Caps Black - AliExpress
How To: Fix Sticky R1/L1 Buttons on DualShock 4 Controller - YouTube
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How to fix any broken triggers issues including L1, L2, R1 or R2 buttons not responding properly - YouTube
How to fix a PS4 Dualshock 4 with sticky L1 & R1 buttons - YouTube