As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY BATTERY PACK M1668 AND M1669 FAIL TEST EMERGENCY BATTERY PACK M1668 AND M1669 FAIL TEST<[01] REMOVED; REPLACED; AND PERFORMED GOOD TEST OF EMERGENCY LIGHT BATTERY PACKS; M1668 AND M1669 PER AMM 33-51-06-960-805;[02] VERIFIED CORRECTIVE ACTION 1.