Apple announced a service program indicating that AirPods Pro manufactured before October 2020 might suffer from ANC issues. People that went through the replacement program say that the mesh on them are now a little more recessed but the ANC is also less efficient. It would be interesting to see a side-by-side comparison between AirPods Pro manufactured prior to October 2020 and a pair manufactured after Nov 2020 to see if there are indeed hardware changes?