As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE NOISE DURING START-UP AND SHUT-DOWN. REMOVED AND DISASSEMBLED MO5, 4, AND 3. FOUND COVER AND DEFLECTOR BROKEN AND RUBBING ON MO4 TURBINE DISC. THIS IS 2ND TIME THIS ENGINE SERIAL NUMBER HAS HAD A COVER AND DEFLECTOR BROKEN. SUBMITTER SUGGESTS A DIFFERENT STYLE COVER AND DEFLECTOR ABLE TO WITHSTAND ENGINE HEAT AND NORMAL VIBRATION LEVELS.