What was found
ENGINE MODEL FJ44-4A, S/N 211135, FROM AIRCRAFT N503TF), WAS RETURNED TO THE REPAIR STATION FOR UNSCHEDULED REPAIR. OPERATOR STATED HE DETECTED A BLEED ODOR DURING CLIMB, PROMPTING A RETURN TO AIRPORT. LANDING UNEVENTFUL. TROUBLESHOT ISSUE WITH TECH, REPORTED PRESENCE OF OIL IN ENG TAILPIPE. TROUBLESHOT ISSUE WITH TEXTRON MECH, BORESCOPE INSPECTION OF ENGS COMPRESSOR REVEALED FOD DAMAGE TO THE HPC, RESULTING IN THE ENGINE OEM DIRECTING REMOVAL OF ENG FOR RETURN TO REPAIR STATION. DISASSEMBLED ENG REVEALED ONE LIBERATED 1ST-STAGE IPC ROTOR BLADE. INSPECTIONS REVEALED A CRACK IN THE INTERSTAGE HOUSING'S BEARING CAVITY, WHICH IS DEEMED TO BE ROOT-CAUSE OF THE BLEED ODOR ISSUE SQUAWKED BY THE ACFT OPERATOR.