What was found
AIRCRAFT WAS GROUNDED: FOUND EMERGENCY LIGHTS ON WITH SWITCH IN OFF POSITION. WAS FINALLY ABLE TO TURN OFF EMERGENCY LIGHTS NORMALLY. DURING OPERTIONAL CHECK OF EMERGENCY LIGHTS FOUND ENTIRE AFT CABIN AFT OF FIRST CLASS FLOOR AND OVERHEAD EMERGENCY LIGHTS TO TURN OFF AFTER ONLY 5 SECONDS OF BEING TURNED ON. SUSPECT BATTERY PACKS TO BE FULLY DRAINED. REMOVE AND REPLACED LIGHT MODULE. PER AMM 25-25-11 OPERTIONAL CHECK GOOD.