As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO PLATFORM DURING TAXI, AN EICAS MESSAGE AND STATUS FLAP/SLAT CONTROL WAS SHOWN AND CONTROL SURFACE WITHOUT MOVEMENT. MAINTENANCE PERFORMED FIM DMC-B787-A-27-50-F1-J9A-421A-A PROCEDURE, CONFIRMING THE FAILURE AND THE ENGINE START FLAP LEVER MODULE TEST WAS PERFORMED IAW AMM DMC-B787-A-27-51-00-13A-320B-A AND THE MESSAGE DISAPPEAR, TESTED CORRECT.