This shouldn't void your warranty. You can contact customer service for better clarification based on your country, laws, and what's allowed.
The Red "warranty void" sticker on the battery and heat pipe does not void your warranty provided you do not damage anything inside of the device and restore it to a factory original condition before the RMA
Be extremely careful when removing the back panel screws, and daughterboard screws as they can strip!
BY FOLLOWING THIS GUIDE YOU TAKE RESPONSIBILITY FOR YOUR OWN ACTIONS
Instructions
Remove back panel
Unplug battery
Remove ribbon cables from each daughter board
Remove screws from each daughter board
Gently remove the Left and Right stick PCB
Wrap joystick stem with a few wraps of tape until it look similar to this picture.
Repeat for both sides
Reinstall thumbstick cap and ensure that theres no play in it.
Reinstall left and right daughter board back into the shell.
Plug back in the haptics wires.
Screw PCB's back in.
Afix ribbon cables back.
Plug the battery back in.
Close the shell all the way (so the light sensor isn't tripped),
Plug in the OEM charger, press and hold the power button, and release once the screen is on.
Once on the Republic Of Gamers screen you must wait around 180 seconds for it to boot
Test inputs with Gamepad tester to make sure everything is working correctly
Screw case back together if everything is working correctly
