What was found
(CAN) ENG SUSPECT INTERNAL VIBRATION. SOURCE OF VIBRATION WAS 6, BROKEN BY STRESS RUPTURE, P/N 3101512-6 BLADES ON FIRST STAGE T-WHEEL ASSY. P/N 3101512-6 BLADES ARE NO LONGER BEING INSTALLED. IT IS NOTED THAT 6 P/N 3101512-6 BLADES WERE REPLACED DURING A PROP STRIKE INSP AT ENGINE TSO 166:09. P/N 3108125-1 BLADES ARE BLADES THAT ARE INSTALLED NOW. DOWNSTREAM IMPACT DAMAGE CAUSED BY BROKEN BLADES EXITING ENGINE VIA GAS PATH AND SUBSEQUENT VIBRATION RELATED DAMAGES ARE MAJOR EXPENSE IN THIS REPAIR. A HOT SECTION AND GEARBOX INSP CAN BE SIGNED OFF WITH THIS REPAIR. ENGINE WILL REQUIRE TEST CELL RUNS FOR RECOMPENSATION, VIBRATION SURVEY, TORQUE CALIBRATION, LEAK AND FUNCTION CHECKS.