As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, A LOUD WHISTLING NOISE WAS REPORTED BY THE CREW. SUBSEQUENT INSPECTION REVEALED THE ENGINE-MOUNTED AIRFRAME EXHAUST DUCT HAD FRACTURED AND LIBERATED WITH RESULTANT DAMAGE TO THE MAIN ROTOR AND VERTICAL FIN. P&WC WILL MONITOR THE INVESTIGATION OF THE INCIDENT AND WILL ADVISE OF ROOT CAUSE ONCE DETERMINED.