As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN FLIGHT THE LEFT SIDE OF THE UPPER ENGINE COWLING CAME LOOSE. THIS CAUSED THE COWLING TO RISE UP AND RIP OUT THE FORWARD PINS. A LARGE SECTION OF THE LEFT SIDE WAS TORN AWAY AND LOST. NO DEFECTS OR REPAIRS WERE NOTED ON THIS COWLING PRIOR TO FAILURE.