As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TWO HOURS INTO THE FLIGHT MANY OF THE EMERGENCY LIGHTS CAME ON, LT FWD COACH FLOOR LIGHTS, DOOR 2L RT LIGHTS. THE LIGHTS EVENTUALLY EXTINGUISHED, FAULTY EMERGENCY LIGHT BATTERY CHARGER AT DOOR 2L M733. REPLACED CHARGER & BATTERY, REPLACED WEAK BATTERY AT CHARGER M737 AT DOOR 4L. ALL EMERGENCY LIGHTS OPERATE NORMAL.