As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REF T/C 78233001 EMERGENCY LIGHTS ASSOCIATED TO EMERGENCY POWER SUPPLY M1672 AND M1675 FAILS CAPACITY CHECK. GROUNDED - YES. REMOVED AND REPLACED EMERGENCY LIGHTS BATTERY PACK M1672 AND M1675 POWER SUPPLY REF BOEING AMM TASK 33-51-06-960-805. OP TEST GOOD. EMERGENCY LIGHTS WORKING AS REQUIRED. NO FURTHER DEFECTS.