As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALL EMERGENCY LIGHTS RELATED TO BATTERIES PACK M1670 AND M1671 FAILED TO TEST. PERFORMED GOOD DEEP CYCLE AND FUNCTIONAL TEST OF EMERGENCY BATTERY PACK M1670 IAW AMM 33-51-06-600-802. REMOVED & REPLACED WITH SERVICEABLE UNIT AND PERFORMED GOOD INSTALLATION TEST OF M1671 BATTERY PACK IAW AMM 33-51-06-960-805.