As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING SHUTDOWN PILOTS NOTICED A WHISTLING SOUND COMING FROM MAIN ROTOR BLADES. DURING A VISUAL INSPECTION AFTER ROTORS HAD STOPPED A POCKET LOWER SKIN WAS SEEN TO BE MISSING. ROTOR BLADE WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE.