As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE CYLINDER DAMAGED. A PIECE OF THE NICKEL CARBIDE BORE COATING MISSING FROM THE TOP AREA OF THE CYLINDER BORE. SIZE OF MISSING PIECE APPROXIMATELY 20MM BY 5MM BY 0.254MM DEEP (0.78IN BY 0.19IN BY 0.010IN DEEP). THE SECOND COMPRESSION RING WAS ALSO FOUND BROKEN IN TWO PLACES APPROXIMATELY 40MM (1.57IN) APART. THE FLOATING PIECE WAS JAMMED IN THE PISTON RING GROOVE AND WAS STARTING TO BREAK UP.