As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING EMERGENCY LIGHT BATTERY PACKS CHECK, CHECK FAILED AT ALL LOCATIONS. CHECKED EMERGENCY BATTERY PACKS AFTER COMPLETELY DISCHARGED AND RECHARGED TWO HOURS, THEN FOUND BATTERY PACK M732 FAILED. REPLACED BATTERY PACK M732 IAW AMM 33-51 AND CHECKED OK.