What was found
EMERGENCY EXIT LIGHTS ASSOCIATED WITH BATTERY PACK M1670 INOP. WHILE TROUBLESHOOTING VERIFIED GOOD GROUND AND POWER WIRES TO D10716. SWAPPED GOOD WORKING BATTERY PACK AND BATTERY PACK WOULD NOT CHARGE. ALSO EXISTING BATTERY PACK WOULD NOT HOLD A CHARGE. REMOVED BATTERY PACK PER AMM 33-51-06-960-805. STEPS 4.D.3.(C) AND 4.D.4. ALSO REMOVED AND REPLACED POWER SUPPLY BATTERY CHARGER PER AMM 33-51-06-960-806 STEPS 5.E.(3)(C) AND 5.E.(4). REMOVED AND REPLACED EMERGENCY LIGHT BATTERY PACK M1670 AND PERFORMED SATISFACTORY INSTALLATION TEST PER AMM 33-51-06-960-805 STEPS 4.D.(4)-(6). INSTALLED AIR GRILL PER AMM 33-51-06-960-805 STEP 4.E.(3).