As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS LEFT SIDE IN PASSENGER COMPARTMENT FAILED TO TEST FROM F/A PANEL. REMOVED AND REPLACED EMERGENCY BATTERY PACKS (M737) AND (M734) DUE TO LOW VOLTAGE READINGS IAW SUPPLEMENTAL AMM 33-51-22. OPERATIONAL CHECK SATISFACTORY. NO FURTHER DEFECTS NOTED. AIRCRAFT RELEASED TO SERVICE.