Run a Daughter Card Test for the 319.5MHz radio and note the result.
To run, navigate to Settings > Advanced Settings > System Tests > Daughter Card Tests > Run SRF-319
Currently there are no sensors reporting a malfunction or an offline status. This indicates the RF 319.5 radio is communicating successfully at this time.
Do you know the date code on the Zone 3 Downstairs CO Detector? What about the age of the impacted 319.5MHz window sensor?
Additionally, where is the panel located in the residence? Main floor, basement, on an outer or inner wall, etc.
The only issue being reported atm is the Zone 15 Master Bathroom old sensor is reporting a tamper. Steps on how to address can be found here: