Sony WH-1000XM3 Earpad Foam Screens Replacement

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Inside the earcups there are two foam screens that with time can get dirty and/or degrade.

As reported by Sony's partner Encompass, OEM part numbers are 4-738-572-01 (left) and 4-738-573-01 (right)

Third-party screens are usually sold together with ear cushions.

Before beginning, turn off the headphones
For more information, see Sony WH-1000XM3 Earcup Cushion Replacement
Insert a plastic spudger between the cushion and the earcup frame
There are six clips that hold the cushion in place, release them moving the spudger around the frame

Gently pull away right and lef foam screen
Screens are made by three pieces glued together, leverage on the ones glued to the earpad to avoid damaging the old screens (you will need them as reference for the tape placement)