As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. DURING THE CABIN INTERCOMMUNICATION DATA SUPPLY EMERGENCY POWER SUPPLY UNIT SYSTEM TEST DISCOVERED FAULT CODES "BAT/ESPY (11WL) EMER LT" AND "BAT/ESPY (12WL) EMER RT." REMOVED AND REPLACED BATTERY OF EMERGENCY POWER SUPPLY UNIT (11WL) EMERGENCY LEFT (AALA202011029004) AND EMERGENCY POWER SUPPLY UNIT (12WL) EMERGENCY RIGHT, PER AMM 33-51-38.