Most likely, another Designated Market Area rule requirement. You are outside of KQED's DMA, so another PBS station, who's DMA you are in, complained and Comcast was forced to remove KQED.
I am very unhappy about the dropping of KQED. I do not really care who"s sphere of influance Fairfield is considered to be in, I do not watch KVIE very often. KQED is my go to local channel. This may be the straw that breaks the camels back. Comcast, you should have polled us first. I am guessing there are far more people in this community who watch and support KQED over KVIE. Reinstate KQED.
I checked with KVIE, Sacramento PBS and they replied: