HOW TO FIX THE R2 BUTTON ON THE PS4 CONTROLLER (DETAILED) - YouTube
PlayStation 4 controller - R2 trigger has came off one of these little hinges (more detail in comments) : r/fixit
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Fixing Playstation 4 controller with bad R2 button doesn't fully press - YouTube
how to fix L2,L1,R2,R1 button (If unfunctioning) Ps4 controller - YouTube