As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON ROLL UP/DOWN OF THROTTLE, PILOT ENCOUNTERED EXCESS VIBRATION (FELT AND HEARD). INSPECTED BLADES AROUND TRIM TABS AND DISCOVERED DELAMINATION FORWARD OF THE TRIM TAB ON THE BOTTOM SIDE OF THE BLADE, APPROX THE SPAN OF THE TAB (10") AND THE EXTENDS APPROX 5" FORWARD FROM THE T/E. TAB REPLACED.