| Clue | Source | Date |
|---|---|---|
| Targets of biannual battery replacements | LA Times Daily | 14 Mar 2026 |
| Fire detectors on ceilings | Newsday | 23 Feb 2026 |
| Fire warning devices (5,6) | ||
| Fire detectors (5,6) | ||
| They beep when tested | New York Times | 05 Jan 2024 |
| Signals to leave? | New York Times | 24 Sep 2015 |
| Signals to leave? |