As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4313 THE CREW REPORTED THE CABIN EMERGENCY LIGHTS ON ICU WILL NOT GO OFF. THE CREW WAS UNABLE TO COMMUNICATE WITH FLIGHT ATTENDANT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE AURAL WARNING UNIT IAW EMB-145 AMM 31-51-01. PERFORMED OPERATIONAL CHECK OF PASSENGER ADDRESS & CABIN INTERPHONE SYSTEM IAW EMB-145 AMM 23-31-00. THE AIRCRAFT WAS RETURNED TO SERVICE.