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 PRE L3 SLIDE CHANGE, EMERGENCY POWER SUPPLY UNIT BITE CHECK FOUND MESSAGES BATTERY/EMERGENCY POWER SUPPLY UNIT (10WL) FORWARD LEFT & BATTERY/EMERGENCY POWER SUPPLY UNIT (13WL) AFT LEFT. REMOVED AND REPLACED EMERGENCY POWER SUPPLY UNIT BATTERIES AT 10WL (AALA202411069565) AND 13WL.