As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING LINE CHECK, MAINTENANCE FOUND THAT THE EMERGENCY PATHWAY LIGHTING IN ROWS 12 THROUGH 15 OF COACH SEATS IN THE CABIN HAD FAILED. MAINTENANCE REPLACED THE EMERGENCY PATHWAY LIGHT POWER SUPPLY AT THE OVERWING EXIT. INSTALLED NEW BATTERIES AND OPERATIONALLY CHECKED THE SYSTEM.