I looked at my 931 webpage since I was getting ready to put an order in for supplies and it shows an error for the black drum, I remember a few weeks ago it giving a replace error and I pulled it out and put it back in, probably done another 10-15k through it since then, I have another 5000 piece job to run through it in the morning so will see if it forces me to replace it or not. Not sure if this is a fluke or not.