As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAILED EMERGENCY LIGHT SYSTEM BATTERY PACK M1672 (REF AAR NR 100 0028372) FAILED FUNCTIONAL CHECK DURING D CHECK IN RFD REMOVED BATTERY PACK M1672 ON RH SIDE FORWARD CABIN IAW B737 AMM 33-51-06-960-805. INSTALLED BATTERY PACK M1672 ON RH SIDE FORWARD CABIN IAW B737 AMM 33-51-06-960-805 AND PERFORMED OPS. TEST. IAW B 737AMM 33-51-00-710-801. TEST PASS.