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 M1670 FAILS CAPACITY CHECK (REF. AAR NR 1000031768). EMERGENCY LIGHTING BATTERY PACK M1670 FAILED FUNCTIONAL CHECK DURING THE C CHECK VISIT IN RFD. REMOVED AND REPLACED BATTERY PACK M1670 IAW B737 AMM 33-51-06-96 0-802 AND PERFORMED OP TEST GOOD.