As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN PERFORM EMERGENCY LIGHT PACK CAPACITY TEST FOUND M5168, M5169 ; M5170 BATTERY FAIL(<P>1. IAW AMM 33-51-04-902-001-001 REV 103 REPLACED EMERGENCY LIGHT BATTERY ASSY AT M5168, M5169 & M5170. 2. IAW AMM 33-51-04-902-001-001 REV 103 PERFORMED EMERGENCY LIGHT BATTERY ASSY INSTALLATION TEST AND THE RESULT WAS SATISFACTORY