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Those channels would have been droped by the owner of the local, OTA station.
When the local owner drops a subchannel they are no longer available to Comcast. You shoud connect the local channel to see what is going on.
I went to wlfi tv 18 web site they tell a hole different story they are not the ones reasonable for comcast taking off there channel. I sure don't like getting lied to,so what do you have to say about that??