As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SPOLIER EMCU NO OUTPUT MSG ADVISORY CAPTAIN REPORTED THAT DURING DESCENDS, MESSAGE SPOILER 27646100 WAS SHOWN. MAINTENANCE PERSONNEL PERFORMED FIM DMC-B787-A-27-60-F1-FHA-421A-A PROCEDURE, FINDING FAILURE OF SPOILER ELECTRIC MOTOR CONTROL UNIT PER MESSAGE “NO OUTPUT”; IT WAS REPLACED EMCU P/N: CA72711-006 S/N: 06538 IAW AMM B787-A-27-61-18-00A-520A/720A-A; TESTED CORRECT.