On the 2 ear cup casing there should only be left the cable that connects to the battery and mic.

Remove the outer panel that covers the battery and the same outer plate on the other side.

This part is by far the most tedious of the fix

Inside the casing there should be multiple glue spots like the ones shown in the picture. I used a nail clipper with the shape of a plier to cut them in square shapes (like shown in the picture)