There are some variations amongst the ESP950's but as with most of the Koss versions, they aren't well documented. I have come across a set here (quite old) that had more damping then the newer units. I would start off removing all foam and if you want to go hard core, remove the black filter on the metal grill. Btw. The screws and underneath the pads which are just pulled off.
I just read though it and I may compile some more impressions later on and add them but that looks good.