As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, A NOISE WAS HEARD IN THE MAIN ROTOR SYS, FOLLOWED BY A VIBRATION THAT INCREASED. A PRECAUTIONARY LANDING WAS PERFORMED. FOUND EROSION TAPE HAD SEPARATED FROM NR1 MAIN ROTOR BLADE. WHEN THE TAPE SEPARATED, IT ALSO PULLED UP SOME FILLER MATERIAL FROM THE TOP SURFACE OF THE BLADE.