As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MKE - FLT 619 - AIRFRAME VIBE AT 280 KNOTS WAS WRITTEN ON TERMINATION ATW LAST NIGHT, EXTENSIVE T/S REVEALED NO DEFECT. MAINTENANCE REQUESTED CHECK FLIGHT AND CONFIRMED VIBE WHEN ROLLING TO RIGHT, SUSPECT SPOILER. REMOVED AND REPLACED RT ROLL SPOILER ACTUATOR, OPS CHECKED GOOD.