As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSENGER CABIN EMERGENCY LIGHTS, BATTERY PACK M1674 FAILS CAPACITY CHECK (REF. AAR NR 1000031766). BATTERY PACK M1674 FAILED FUNCTIONAL CHECK DURING C CHECK IN RFD. REMOVED AND REPLACED BATTERY PACK M1674 IAW B737 AMM 33-51-06-960-802 AND PERFORMED OPERATIONAL TEST GOOD.