What was found
AIRCRAFT RETURNED TO PLATFORM DUE TO BEFORE TAKEOFF RUN, A SPOILER MESSAGE APPEARS ON EICAS AND STATUS. MAINTENANCE PERSONNEL PERFORMED FIM DMC-B787-A-27-60-F1-91A-421A-A PROCEDURE, NO CONFIRMING FAILURE. AT MEX, AS A PRECAUTIONARY ACTION, THE SPOILER 10 ELECTRO MECHANICAL ACTUATOR WAS REPLACED, IAW AMM DMC-B787-A-27-61-16-00A-520A-A/720A-A. TESTED CORRECT AND THE WIRING AND LOOSE CONNECTORS ON THE SPOILER 10 EMCU M2761110 WERE VERIFIED, IAW WDM 27-61-15, ALL CORRECT.