As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3979 THE FLIGHT ATTENDANT REPORTED THE PILOT EMERGENCY LIGHTS ON, ON THE BACK PANEL. THE AIRCRAFT WAS REMOVED FROM SERVICE. FOUND LOW VOLTAGE SIGNAL COMING OUT OF PIN 10 OF FORWARD FLIGHT ATTENDANT HANDSET REMOVED AND REPLACED THE FORWARD FLIGHT ATTENDANT HANDSET IAW AMM 23-31-03. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.