As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT HAD VERTICAL VIBRATION ON SHORT FINAL TO LAND. INSPECTED AIRCRAFT, FOUND LOWER TRIM TAB HAD DISBONDED ON M/R BLADE PN 212-015-501-5, SN A262. AFTER CLOSER INSPECTION, FOUND CORROSION UNDER TAB. REMOVED M/R HUB AND BOTH M/R BLADES FOR CONVENIENCE. INSTALLED SERVICEABLE M/R HUB AND BLADES. COMPLETED GROUND RUN AND OPERATIONAL FLIGHT CHECK. AIRCRAFT RETURNED TO SERVICE. AIRCRAF TT: 4,949.3 HOURS.