Ah beat me to it! As he said resolve your power issue
I would check again your settings you may have missed something , did the place. ever use a pstn connection?
How did you drop each line?
Didn't think you need to power Rios down if it's the com on the panel , just power cycle the panel,
If it doesn't work save the configuration and remove one line at a time to see how many modules get removed this would prove your theory that there is no other device somewhere extra on the line
But as above pstn otherwise
Didn't think all three would connect to an alarm panel just like that, as above meter it but meter them with fire fault on and off to see which one gives you what you want, you might want to dis the sounders if you can when doing so
Why can't we just be recognised with courses we already have , alarm courses don't teach you as much as you learn electronic s field for example
We be all retired by then hopefully lol
Having taken over lots of adt systems , adt are famous for this ,cans you may cause more problems just replacing the battery , better to get someone even if it's a one off to check the charging circuit ie quick service , doesn't cost allot really