As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS INOPERATIVE AT ROWS 8 THRU 14 IN MAIN CABIN. SWAPPED 2503 BATTERY AND CHARGER, NO HELP. TRIED OTHER BATTERIES FROM OTHER LOCATIONS, NO HELP. 2503 DOES TEST. HOWEVER ONLY T-LAV LOWER LIGHTS AND 2 CEILING LIGHTS FUNCTION. TESTED ALL BATTERY PACKS AND CHARGERS AT OTHER LOCATIONS, ALL FOUND TO BE NORMAL. REF AMM 33-51-00. R & R EMERGENCY POWER SUPPLY M2503 PER AMM 33-51-06-960-806. OPS CHECK GOOD.