As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OPERATIONAL TEST OF EPSU SYSTEM TEST AND FOUND FORWARD LEFT (FIN:10WL) BATTERY OF THE EPSU REQUIRED A REMOVAL AND REPLACE. / REMOVED AND REPLACED FORWARD LEFT BATTERY OF THE EMERGENCY POWER SUPPLY UNIT. IAW AMM 33-51-38-000-002-A AND IAW AMM 33-51-38-400-002-A. OPS CHECK GOOD."