As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHT INSIDE CABIN ROW 12 ABC; 9 ABC ARE INOP <[01]. DURING TROUBLESHOOTING; DETERMINED THAT THIS DEFECT AND DEFECT TTG8Q00YW88E 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.; [02] VERIFIED CORRECTIVE ACTION #1.