As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UPON RETURNING AFTER A TRIP THE PILOTS REPORTED A (HUMP) (VERTICAL VIBRATION) ON THE AIRCRAFT. A VISUAL INSPECTION WAS CARRIED OUT ON THE MAIN ROTOR HEAD, BLADES, PITCH LINKS, AND THE SWASHPLATE. CHECKING THE SWASHPLATE FOUND IT TO HAVE AN EXCESSIVE AMOUNT OF PLAY.