New Around Here
It seems that the upstairs line is the issue, as the basement is now working after some troubleshooting. There's no wall wart I can find so maybe there's a splitter issue for the wiring going upstairs? I'm gonna test some things and find out.It could be anyplace including a crawl space or attic. Don't necessarily need to be near an AC outlet as some AMPs can be powered over coaxial.
Remember seeing a wall wart plugged in with a piece of coaxial cable on it going from wall wart to coaxial jack?