Best way to replace the cable?

Hi! The last 2-3 pairs of these headphones I always have the same issue. A broken wire. From cats, from yanks, to many things. I am finally changing to a pair of wireless headphones from Steelseries but I wanna still try to fix these as a backup (Or if I think I did a good enough job maybe even resell) The first 2-3 inches of wire coming from the headset itself is where the broken wire is. So I can’t simply splice and repair as I think the entire wire is loose from the board. But I can’t seem to open the area where the wire is hiding. Any ideas? Google is not giving me any answers.