As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MID AREA SECTION BETWEEN ROWS 17 TO 23 EMERGENCY LIGHTS FAILED BATTERY PACK CAPACITY FUNCTIONAL CHECK. GROUNDED - YES. REMOVED AND REPLACED AT STA 727 C+13 POWER SUPPLY BATTERY PACK M1671 AND PERFORMED OPS CHECK GOOD IAW B737 AMM 33-51-06-960-802.