As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY PASSENGER CABIN LIGHTS M1694 FAILS BATTERY CAPCITY CHE CK (REF. AAR NR 1000043131). EMERGENCY LIGHTING BATTERY PACK AT M1694 FAILED FUNCTIONAL CHECK DURING D CHECK IN RFD. M1694 BATTERY PACK FAILED CAPACITY. REMOVED AND REPLACED BATTERY PACK M1694, TEST GOOD IAW B737 AMM 33-51-06-960-805.