As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: EMERGENCY LIGHTS FAILED OPERATIONAL TEST. MAINTENANCE REPLACED EMERGENCY POWER SUPPLY UNIT 10WL (AALA202506204557) AND BATTERY (AALA202506202086) PER AMM 33-81-38. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.