What was found
COMPRESSOR WAS REMOVED DUE TO F.O.D. SPLINE ADAPTER WAS REMOVED IN ORDER TO DISASSEMBLE COMPRESSOR ROTOR FOR REPAIR. SPLINE ADAPTER WAS FOUND TO HAVE A RING OF CORROSION AROUND OUTSIDE CIRCUMFRENCE OF ADAPTER .650 INCH FROM REAR END OF ADAPTER. CORROSION IS AT THE POINT WHERE THE ADAPTER SEATS INTO THE IMPELLER AT THE JUNCTION OF THE ADAPTER AND THE REAR END OF THE IMPELLER. CORROSION IS AT THE SAME LOCATION WHERE CHEVRON PREVIOUSLY HAD AN ADAPTER FAIL THAT RESULTED IN AN IN FLIGHT ENGINE FAILURE AND UNSCHEDULED LANDING. SPLINE ADAPTER FIT AND INSTALLATION WERE IN ACCORDANCE WITH MAINTENANCE INSTRUCTIONS. SPLINE ADAPTER WAS REPLACED. COMPRESSOR IS STILL IN SPARES AT THIS TIME AND HAS NOT BEEN RETURNED TO SERVIC