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 M1671 FAILS FUNCTI ONAL TEST (REF AAR NR 1000032892). REMOVED AND REPLACED BATTERY PACK FROM EMERGENCY POWER SUPPY M16 71 IAW B737 AMM 33-51-06-960-805. TEST GOOD. FAILED FUNCTIONAL CHECK DURING RELIABILITY HOLD IN RFD. REMOVED AND REPLACED BATTERY PACK FROM EMERGENCY POWER SUPPY M1671 IAW B737 AMM 33-51-06-960-805. TEST GOOD.