As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON DESCENT, THE SPEED BRAKES WERE OPENED WHEN COMMANDED TO CLOSE. THE ACFT EXHIBITED A PRONOUNCED BUT CONTROLLABLE ROLL TO THE RT, FOLLOWED BY SPOILER FAIL MSG ON EICAS. AFTER 15 - 20 SECS THE ACFT RETURNED TO NORMAL CONFIG & THE SPOILER FAIL MSG EXTINGUISHED. PROBLEM REOCCURRED DURING LANDING ROLL OUT ALSO. R & R SPEED BRAKE ACCUMULATOR ON RT SIDE IAW AMM 27-62-02. OPERATIONS CHECKED GOOD, NO DEFECTS NOTED.