As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) INVESTIGATION INTO A FLIGHT CREW REPORT OF AN INTERMITTENT AIRFRAME RUMBLE DURING FLIGHT REVEALED THAT THE LT CENTRE GROUND SPOILER WAS FLUTERING IN CRUISE FLIGHT. A WORN SPOILER ACTUATOR BOLT WAS REPLACED AND THE AIRCRAFT WAS RETURNED TO SERVICE.