As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHT INOP AT SEAT 18A. R&R INVERTER ASSY #2 WITH #3. OPS CHECK SAT, RETURNED TO ORIGINAL POSITIONS. FOUND INVERTER ASSY NOT TO BE AT FAULT. FOUND EMERGENCY BATTERY PACK #3 TO BE AT FAULT. R&R EMERGENCY BATTERY #3. OPS CHECK SAT. NO FURTHER DEFECTS NOTED.