As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERGENCY LIGHTS, M1670 FAILED BATTERY CAPACITY CHECK. REMOVED AND INSTALLED A NEW BATTERY PACK M1670 IAW AMM 33-51-06-960-805 STEP 4.(E). & AMM 33-51-06-960-805 UP TO STEP 4.E.(7).(A). AND PERFORMED INSTALLATION TEST OF BATTERY PACK M1670 IAW AMM 33-51-06-960-805 STEP 4.E.(7).(B) TESTED GOOD.