As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. AT CRUISE EICAS MESSAGE "SPOILERS", NR 5 SPOILER NO OUTPUT APPEARED. A NOTICEABLE SLOW AIRCRAFT ROLL AND FLUTTER/BUFFETING WAS REPORTED BY THE FLIGHT CREW. THE AIRCRAFT DIVERTED TO ORD WHERE IT LANDED SAFELY WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. REPLACED NR 5 SPOILER ELECTRIC MOTOR CONTROL UNIT AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 27-61-18.