As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE CONTROL AND SPEED BRAKE CHECK, THE RT ENGINE SHUTDOWN AFTER BRINGING THE THROTTLE TO IDLE. RAN BOTH ENGINES AND ACCOMPLISHED RAPID DECELERATION CHECKS ON BOTH (10 TIMES) EACH. NO DISCREPANCIES NOTED. TAXIED TO RUN-UP AREA AND EXTENDED SPEED BRAKES. RAN ENGINES ABOVE 85 PERCENT N1 AND SPEED BRAKES STOWED. RAPIDLY DECELERATED BOTH ENGINES, NO FAULTS. CHECKED IDLE INDEX ON FUEL CONTROL UNIT. CHECKED GOOD. DONE IN REF TO MM.