As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EPSU BATTERY AFT LIGHT MESSAGE POPULATED WHEN PERFORMING EMERGENCY LIGHT TEST VIA PTP. NO SYS OK. REMOVED AND REPLACED EPSU BATTERY AFT LIGHT PER PTP IAW AMM 33-51-38-000-002-A AND 33-51-38-400-002-A . PERFORMED OPS CHECK OF THE EMERGENCY POWER SUPPLY UNITS, BITE-CHECK IAW TASK CARD 18-3351-1-0003. OPS CHECK GOOD, SYSTEM OK. LED CAME ON.