What was found
DURING CLIMB, EVM GMP AMBER BOX WITH 5.0., PULLED THROTTLE TO IDLE AND COMPLIED WITH QRH. ADVANCED ENG THROTTLE, COULD FEEL AND HEAR A NOTICABLE VIBRATION. RECEIVED AMBER BOX OF 4.0 AT 60 PERCENT N1 LEFT ENGINE AT IDLE FOR APPROACH AND LANDING. DURING TAIL PIPE INSPECTION, MX FOUND NUMEROUS TURBINE BLADES DAMAGED ON NR 3 ENGINE. R & R NR 3 ENGINE IAW WC 29T0303, 71T0003-GE, 71T0903-GE, 79T0203, COMPLETED 80 PERCENT ENGINE RUN AND LEAK CHECKED GOOD, NO LEAK NOTED, OPS CHECKED GOOD.