What was found
AFT OF WING EMERGENCY SLIDE LIGHT BOTH LH AND RH SIDE ARE OUT <[01]. DURING TROUBLESHOOTING; DETERMINED THAT THIS DEFECT AND DEFECT TTG8Q00YW88S ARE BOTH CONTROLLED BY BATTERY CHARGER/POWER SUPPLY ASSEMBLY M1670 PER WDM 33-51-13. REPLACED BATTERY PACK/CHARGER ASSEMBLY AND TESTED PER AMM 33-51-06-960-805 AND AMM 33-51-06-960-806; NO DEFECTS NOTED. NOTE: PARTS REPLACEMENT DOCUMENTED ON MSI DEFECT TTG8Q00YW88S;[02] VERIFIED CORRECTIVE ACTION #1.