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 AND 19 OF THE CABIN GO DIM AFTER ABOUT 3 SECONDS. MAINTENANCE REPLACED THE BATTERY PACK AT THE OVERWING AFT LEFT EXIT LIGHT ASSEMBLY. LIGHTS RETURNED TO NORMAL FUNCTION AND OPERATIONAL DURATION.