Do u remember an airport we velcroed to back of tv in kitchen. I think maybe that one was forgotten. We are having trouble downloading Apple TV movies. That airport is yellow and has phone jack that is not connected to anything?
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I only updated the airport devices I saw listed in the airport utility.  I left with all devices green.  An airport express can blink yellow if it’s having a problem or if it simply needs an update.  I updated all the devices listed so it may be offline for some reason.  Not sure what room your AppleTV was in but if it was the room across from the kitchen downstairs where the xbox was temporarily then any Apple TV placed at that television should still be getting an adequate signal since it is so close to the larger router in your data closet on the other side of the house near the stairs.  If you would like to re-add the airport express, you can hold down the reset button on the back and then use airport utility to re add it to the network.