Door Buzzer and Siren/Strobe Stopped

My Smartthings system and Konnected boards (2) have been humming along fine for about a year now.  Very recently both the door "buzzer" and the 12v strobe on the Konnected board stopped working.  I powered down the boards and restarted but no change.  The door switch that triggers the buzzers "beep" is opening and closing properly (electrically speaking).  Both boards display a steady green LED once they are rebooted.

Nothing has changed recently in the way of any wiring or adding devices to Smart Things.  Any suggestions for further troubleshooting?

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