As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTING SYSTEM FAIL FUNCTIONAL CHECK M1671 (REF AAR N R 1000030860). REMOVED AND INSTALLED EMER BATTERY PACK ASSY IAW B737 AMM 33-51- 06-960-805. TEST OK. (M1671) BATTERY PACK FAILED FUNCTIONAL CHECK DURING D CHECK IN RFD. REMOVED AND INSTALLED EMER BATTERY PACK ASSY IAW B737 AMM 33-51- 06-960-805. TEST OK (M1671).