As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH- DURING TAKEOFF THE CREW NOTED THAT E2 ATTCS NO MARGIN, REJECTED TAKEOFF. MAINTENANCE INSPECTED THE ENGINE AND FOUND A LOOSE B-NUT ON THE START CONTROL VALVE. MAINTENANCE TIGHTENED THE B-NUT AND PERFORMED A ENGINE RUN ON THE NR 2 ENGINE. NO DEFECTS NOTED AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.