As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS ASSOCIATED TO BATTERY PACKS M1676, M1671 AND M2627 ARE INOP. GROUNDED - YES. REMOVED AND REPLACED BATTERY PACKS AT M1676 AND M1671 ALSO REPLACED BATTERY CHARGER AND BATTERY PACK AT M2627. ALL ASSOCIATED LIGHTS OPS NORMAL REF B737-900 AMM 33-51-06.