What was found
ENGINE CHIP LIGHT ILLUM ON FINAL APPROACH. MECHANIC INSPECTED ENG CHIP PLUGS & FND FUZZ & LIGHT METAL ON UPPER CHIP PLUG. PENALTY RUN ACCOMPLISHED & WHILE ON SHUT DOWN AT APPROX 35-40 PERCENT N1, MECHANIC HEARD NOISE (HVY GRINDING) FROM ENG AREA. MECHANIC MOTORED ENG & ON SPOOL DOWN, HEARD A GRINDING NOISE COMING FROM TURB ASSY. MECH PULLED ENG CHIP PLUGS & FND A MASSIVE AMT OF METAL ON UPPER CHIP PLUG. UPON TEAR DOWN OF ENG ASSY, INSP REVEALED N1 TURB HARD TO TURN, & A LARGE AMT OF METAL NOTED IN ENG GEARBOX. FURTHER INSP REVEALED FUEL NOZZLE CRACKED APPROX 6-8 INCHES IN LENGTH. NOTED NR 8 BEARING DESTROYED. BOTH GRBX ASSYS SN CAG-35884 & MINI SN KEY-1028 IST (780.5) WERE SENT FOR REPAIR & EVALUATION.