As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, PILOT ENCOUNTERED MODERATE VIBRATION OF MAIN ROTOR FOR 3 SECONDS IN CRUISE FLIGHT THEN IT CEASED. THE AIRCRAFT WAS DIVERTED TO LAFOURCHE AIRPORT IS LANDED WITH NO FURTHER PROBLEM, THE MECHANIC FOUND BLUE MAIN ROTOR BLADE EROSION TAPE TORN HE REMOVED THE TAPE AND THE FOLLOWING DAY THE MAIN ROTOR BLADE WAS CHANGED.