Copy of paper letter regarding planned service outtage

Several weeks ago we received a letter from Comcast that they would be replacing equipment in our area and we could expect to have multiple day-long service outtages over the next two months in Livermore CA. My kids are in online school because of Covid. When I contacted the school district about this, they asked for a copy of the letter. Unfortunately, it already went out in the recycling!

I am trying to get a copy of this letter. It was not sent via email (I checked). I cannot find it in my account anywhere. Where can I get documentation of planned local outtages?