As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OPERATIONAL TEST OF EPSU BAT CAP TEST AND FOUND AFT LEFT BATTERY OF THE EPSU REQUIRED A REMOVAL AND REPLACE. / REMOVED AND REPLACED AFT LEFT BATTERY OF THE EMERGENCY POWER SUPPLY UNIT. IAW AMM 33-51-38-000-002-A AND AMM 33-51-38-400-002-A"