Of course. The yellow over-inking didn't actually start after the developer change, but rather the toner. I changed the developer after it started. I checked the resistances across the TC sensor as well and everything seems ok. I suppose the next step is to check the sensor NVM to be sure its not set to anything crazy. There also seems to be a lot of toner build up in the developer station, but I can't tell if that's a side effect of way too much yellow or the cause. iGen3.