What was found
EMERGENCY LIGHTS NOT WORKING AT ROW 9 AND 11 LEFT SIDE UNDER BIN AREA AND AT RIGHT SIDE FORWARD HATCH. / [01] PERFORMED TROUBLE SHOOTING PER B737 AMM WIRING DIAGRAM 33-51-14; FOUND BATTERY PACK AT POSITION M1670 AT FAULT. PART ON ORDER.;[02] PERFORMED TROUBLE SHOOTING PER B737 WD 33-51-14; FOUND BATTERY PACK AT POSITION M1670 AT FAULT. PART ON ORDER.;[03] VERIFIED STEPS 1 AND 2. OK TO INSTALL SERVICEABLE BATTERY PACK.;[04] REMOVED AND REPLACED EMERGENCY EXIT LIGHT BATTERY PACK M1670 POSITION AS PER B737;AMM 33-51-06-960-805. PERFORMED EMERGENCY LIGHT OPERATIONAL CHECK FOUND NORMAL;[05] VERIFIED STEP 4.