As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD 3 RT EMERGENCY LIGHTS ON OVERHEAD BINS INOP / [01] REPLACED M1676 BATTERY/CHARGER ASSEMBLY AND TESTED PER AMM 33-51-06-960-806. AFTER 30 MINUTES CHARGING; NO LIGHTS; SLAVED BATTERY FROM M1675 (SEE DEFECT TTG8Q00FVHN7) TO CONFIRM LIGHTS WORK WITH KNOWN GOOD BATTERY.