I gave up on replacing the headband when I saw how detailed the cabling is to the earpiece - it splits into 4 distinct soldered hair-thin wires which must be reattached. So knowing how sensitive the board must be to poor soldering, I closed it back up.

Take note that the black foam 'cup' for the microphone inside the ear cover is too small and the mic just pressed up against it. Dont struggle to get the mic into the foam cup. Close that up first.