As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING UNKNOWN PHASE OF AIRCRAFT OPERATION THE CONTROL COLUMN WAS REPORTED CLICKING AND BUMPING UPON ELEVATOR MOVEMENT. THE FAULT WAS TRACED TO LT FORWARD AND AFT YOKE MOUNTING NUTS ON THE FIRST OFFICERS CONTROL COLUMN. THE NUTS WERE RETORQUED PER A BOMBARDIER SERVICE LETTER AND A SATISFACTORY OPERATIONAL CHECK WAS PERFORMED. AIRCRAFT WAS RELEASED FOR CONTINUED SERVICE.