As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AIRCRAFT NOT GROUNDED) DURING EPSU BATT CAP TEST TC 335100-03-1-001 ESPU FWD L (10WL) FAILED REQUIRES REPLACEMENT / REMOVED AND REPLACED EPSU BATT (10WL) FWD L IAW AMM 33-51-000-002-A AND AMM 33-51-38-400-002-A, OPS CHECKED GOOD IAW AMM 33-51-00-710-001"