As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS IN BASE MAINTENANCE: PANEL FAILS EMERGENCY LIGHT SYSTEM TEST. REMOVED AND REPLACED EMERGENCY POWER SUPPLY UNIT 10WL (AALA202111226295), 13WL PER A321 AMM 33-51-38-0401 EMERGENCY LIGHT BUILT IN TEST EQUIPMENT TEST GOOD PER A321 AMM 33-51-00-710-001A.