As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: EMERGENCY POWER SUPPLY UNITS FAILED OPERATIONAL CHECK PER TASK CARD 26L000025012. REPLACED BATTERY PACKS AT EMERGENCY POWER SUPPLY UNITS L1 (AALA202207280118), L2 (AALA202207289617) AND L3 (AALA202207287832) PER AMM 33-51-38. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.