As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISC HAS EXCESSIVE DAMAGE (WARPED CAUSING LOOSE BLADES) RESULTING FROM LAB SEAL ELEMENT RUBBING INTO DISC KNIFE EDGES. THIS LAB SEAL HAS FEWER WELD POINTS AS COMPARED TO THE MORE RECENT SEAL DESIGN. THE LAB SEAL WAS INSTALLED NEW AS A PART OF SB 126 UPGRADE. HERE ARE THE VIBRATION RESULTS OF THE ENGINE TEST CELL RUN AT THE TIME THE ROTOR WAS INSTALLED NEW. DYNR = 0.16, GB-R = 0.21, AD-A = 0.26, PT-R = 0.15. PART TOTAL CYCLES, 1299.4.