As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT EPSU BATTERY IS DISCHARGED 110WL2. REMOVED AND REPLACED THE LT OVERWING EMERGENCY LIGHT BATTERY AND POWER SUPPLY IAW IAW AMM 33-51-38-000-001-A, 33-51-38-400-001-A, 33-51- 38-000-002A, AND 33-51-38-400-002A. OPS TESTED GOOD IAW 33-51-00-710-001-A.