What was found
EMERGENCY LIGHTING INOPERATIVE: INTERIOR OVERWING LIGHTS AT ROW 20A/20F, CEILING LIGHTS ROWS 7 TO 17 AND ROW D BACK, SEAT LIGHTS 3E TO 20D, AND LIGHTS 3/4 WAY DOWN THE CABIN. REMOVED AND REPLACED THE BATTERY PACKS AT B5-101, B5-102, B5-103, AB5-2 AND AB5-3 IAW AMM 33-53-00 AND AMM 33-60-98. OPS CHECKED GOOD. AIRCRAFT WAS GROUNDED.