As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOR FLIGHT 3468, DURING THE PREFLIGHT INSP FOUND BOTH LT AND RT EXTERIOR OVERWING LIGHTS AND INTERIOR EMERGENCY EXIT LIGHTS AT ROW 12 TO BE INOPERABLE. THE ACFT WAS REMOVED FROM SERVICE. TROUBLESHOT SYS. FOUND NR3 EMERGENCY LIGHT BATTERY TO BE FAULTY. REPLACED NR3 BATTERY IAW AMM 33-50-04. THE OPS CHECK WAS GOOD. THE ACFT WAS RETURNED TO SERVICE.