As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CABIN INTERCOMMUNICATION DATA SYSTEM 1 EMERGENCY POWER SUPPLY UNIT SYSTEM TEST ACTIVE SHOWS FAULT 335100 CLASS 1 BATTERY EMERGENCY POWER SUPPLY UNIT (10WL) FORWARD LEFT. REMOVED AND REPLACED 10WL (AALA202211212779) AND 11WL (AALA202211228771) EMERGENCY POWER SUPPLY UNIT PER AMM 33-51-38.