As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: DURING PS CHECK, FOUND SEVERAL EMERGENCY LIGHTS NOT ILLUMINATING IN BUSINESS CLASS BETWEEN DOOR 1 TO DOOR 2. MAINTENANCE TROUBLESHOT AND FOUND EMERGENCY POWER SUPPLY ON DOOR 1R FORWARD BATTERY INOPERABLE. MAINTENANCE ALSO REPLACED POWER SUPPLY PER AMM 33-51-06-960-802 AND PERFORMED SATISFACTORY OPERATIONAL CHECK.