As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A LINE MAINTENANCE CHECK, THE MID CABIN EMERGENCY LIGHTING POWER SUPPLY FAILED SELF TEST. REMOVED AND REPLACED MID CABIN EMERGENCY LIGHTING (OVERHEAD) POWER SUPPLY AND BATTERY. EMERGENCY LIGHTING BITE TESTS GOOD AND OPERATIONALLY CHECKS NORMAL.