As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE REMOVED DUE TO CYCLED 1ST AND 2ND STAGE WHEELS. UPON INSPECTION OF COMPRESSOR PARTS NOTED THE FOLLOWING: STEP WEAR BEYOND SPECS ON SPUR ADAPTER GEARSHAFT FWD AND AFT SPLINES AND STEP WEAR ON INTERNAL SPLINES OF SPLINE ADAPTER BEYOND SPECS. INSTALLED NEW SPUR ADAPTER GEARSHAFT AND SPLINE ADAPTER. SEE MMIR #4670 FOR SPLINE ADAPTER INFORMAITON.