Amazon.com: Replacement Direction Cross Button Left Key Volume Right Keypad Flex Cable Conductive Membrane for Sony PSP 1000 1004 1001 1008 Game Console (L+R +Volume) : Video Games
R button PSP 2000 repair - Free guide - SOSav
Let's Fix my old Playstation Portable - R-Button not working (PSP 2000) - YouTube
Yuxi Replacement Parts L/r Button Flexible Circuit Board Conductive Film For Psp 3000 - Accessories - AliExpress
PSP, help with the "R" button... | MacRumors Forums
PSP Go! Remapping Brightness/Mute button to R2/L2 : r/PSP