These stations disappeared. I chatted with an agent this morning and she tried a lot of things, and told me it make take an hour, and then to reboot my boxes. She even checked the channel lineup in my area - york, pa and said that I should still be getting these channels even though I told her the message on the tv said to 'check with Wpmt'.
I just went to Fox 43 website and found this:
"If you get us over the air, you will need to re-scan to find FOX43 and Antenna TV after 10am on January 3, 2018. Rescanning is the exact same thing you did when installing your antenna.
Also, we will no longer be carrying our subchannel “This TV” over the air or on cable."
So, doesn't anybody at comcast know this? Guess not, as it is still listed in the lineup.