As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FWD L EMERGENCY LIGHTING EPSU FAILS THE CAPACITY TEST. REMOVED AND REPLACED FWD L/M EPSU BATTERY IAW AMM 33-51-38-000-002-A AND 33-51-38-400-002-A AND PERFORMED BATTERY CAPACITY TEST IAW AMM 33-51-00-710-003-A AND NO DEFECTS NOTED.