As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OPERATIONAL TEST OF EMERGENCY LIGHTS, RECEIVED CLASS 1 FAULT FOR BAT/EPSU (10WL) FWD L. / REMOVED AND REPLACED EPSU BATTERY AT FIN 10WL IAW AMM 33-51-38-000-002-A AND AMM 33-51-38-400-002-A. OPS CHECK GOOD IAW AMM 33-51-00-710-001-A."