What was found
OPERATIONAL TEST OF EMERGENCY LIGHTS FAILED DURING HEAVY SERVICE CHECK. R & R EPSU BATTERY PACK L1WL IAW AMM 33-51-00-920-050-A.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
OPERATIONAL TEST OF EMERGENCY LIGHTS FAILED DURING HEAVY SERVICE CHECK. R & R EPSU BATTERY PACK L1WL IAW AMM 33-51-00-920-050-A.