As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE EMERGENCY LIGHT BATTERY PACK CAPACITY TEST, FOUND M5170 BATTERY FUNCTION FAIL(<P>1) IAW AMM 33-51-04-902-001-001 REV 108 R/R EMERGENCY LIGHT BATTERY PACK (M5170). 2) IAW AMM 33-51-04-902-001-001 REV 108 PERFORMED EMERGENCY LIGHT BATTERY INSTALLATION TEST AND THE RESULT WAS GOOD</P>)