As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INOPERATIVE BATTERY PACK ON BATTERY POWER SUPPLY (M02816) AT FWD PASSENGER CABIN. REPLACED BATTERY PACK ON BATTERY POWER SUPPLY (M02816) AT FWD PASSENGER CABIN IAW B737-800 AMM 33-51-06-960-805 AND PERFORMED OPERATIONAL TEST OF THE NEW BATTERY PACK; TEST IS OK.