As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: DID CABIN INTERCOMMUNICATION DATA SYSTEM 1 EMERGENCY POWER SUPPLY UNIT TEST PER PS CHECK, (14WL) MID RIGHT FAILED. FOUND 14WL EMERGENCY POWER SUPPLY UNIT BATTERY LOW VOLTAGE. REMOVED AND REPLACED 14WL BATTERY PER AMM 33-51-38.