What was found
AIRCRAFT IN BASE MAINTENANCE: EMERGENCY LIGHTS SYSTEM TEST FAIL. REPLACED WELS BATTERY UNIT WITH NEW IAW AMM B787-33-51-07-02B, OPS CHECK GOOD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIRCRAFT IN BASE MAINTENANCE: EMERGENCY LIGHTS SYSTEM TEST FAIL. REPLACED WELS BATTERY UNIT WITH NEW IAW AMM B787-33-51-07-02B, OPS CHECK GOOD.