As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING TAXI, A VIBRATION WAS FELT FROM THE ENGINE. INSPECTION AFTER RETURN TO RAMP FOUND ONE .50 INCH STUD AND THREE .3750 STUDS AT NR 1 CYLINDER BROKEN. ALL CYLINDERS WERE REMOVED AND INSPECTED FOR CRACKS AND CONFORMITY. ALL CYLINDERS WERE SERVICEABLE AND REINSTALLED WITH NEW GASKETS. THE ENGINE WAS GROUND RUN AND TEST FLOWN SERVICEABLE.