As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO PLATFORM DUE TO DURING ENGINES START, THE MESSAGE IN EICAS AND STATUS OF SPOILER APPEARS AND FLAPS/SLATS INDICATOR STAYS IN POSITION 1 AND FLAP/SLAT LEVER IN POSITION 5. MAINTENANCE PERSONNEL PERFORMED REVISION, DETECTING MESSAGE OF FAILURE CODE 27-12831 SPOILER NUMBER 4. THE FIM DMC-B787-A-27-60-F1-Q6A-421A-A PROCEDURE WAS PERFORMED, NO CONFIRMING FAILURE, TESTED CORRECT.