Yes these need completely disassembled to replace the headband, have seen nothing but broken headbands at this point, Sony might be revising these at some point as I personally work on hundreds of pairs of headphones and there is a severely weak area where the headband swivels and not much to hold it all together, you also can not replace any parts of the headband without cutting the harness as there is no way of getting the harness through the hangers on the headband.
Just my input, most of the parts on the ear cups can be replaced rather easily.