Turn off the controller and remove the batteries or battery pack
Remove the battery cover
Peel off the grips if your model has them
Remove the hidden screws under the grips and inside the battery compartment
Use a T8 security Torx screwdriver to remove all screws
Separate the front and back shell carefully with a plastic pry tool
Lift the back shell off slowly
Disconnect any internal ribbon cables if needed
Remove the face buttons, sticks, and internal components as required
Reassemble in reverse order after finishing the repair or cleaning