As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT NOTED A VERTICAL VIBRATION DURING FLIGHT. UPON VISUAL INSPECTION, IT WAS FOUND THAT MAIN ROTOR BLADE HAD CRACKED 90 INCHES FROM BLADE TIP THROUGH THE T/E TO THE SPAR AND 7" TOWARDS THE BLADE ROOT ALONG THE SPAR, ON UPPER AND LOWER SURFACES OF THE BLADE.