cyclist44, my guess is the 3100's require a software update.
Do a Check Switch test, then let the receivers reboot.
Once they are up and running, go into the Menu and make sure the receivers are Enabled to accept software updates. I don't have a 3100 anymore, and cannot remember exactly how to get to that menu.
Now turn each receiver off. If there is a new software version available for the receiver, you will see a warning window pop up in about 60 seconds, stating that new software is being downloaded.
Once the download is completed, the information will be written to the receiver's memory, and then the receiver will shut down and reset.
Once this is done, you may need to call Bell to "hit" the receivers again, and everything should work fine.