As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED A BANGING NOISE DURING TAXI COMING FROM THE ENGINE. PILOT THEN TAXIIED TO THE HANGAR AND BROUGHT IT TO MECHANIC ON DUTY THAT DAY. MECHANIC THEN BOROSCOPE ENGINE AND FOUND FIRST STAGE COMPRESSOR HAS MINOR NORMAL WEAR AND TEAR, FIRST STAGE COMPRESSOR GUIDE VANES ARE PARTIALLY MISSING AND SECOND STAGE COMPRESSOR SEVERELY DAMAGED. ENGINE WAS SENT FOR INVESTIGATION, REPAIR AND WARRANTY.