As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH 4000' CREW HAD HIGH ENG VIBRATION WITH EGT GOING INTO YELLOW ARC ON LT ENG. ENG PULLED BACK TO IDLE THRUST & STILL HAD VIBRATION. ENG SHUTDOWN & RETURNED. VISUAL DAMAGE TO TURBINE BLADES. UPON INSPECTION, BORESCOPE, IT WAS DETERMINED THAT TURBINE BLADE FAILURE WAS THE REASON FOR THE VIBRATION. R &R NR 1 ENG, PERFORMED VISUAL INSPECTION OF THE PYLON, COMPLETED ENG RUN CHECKS & LEAK CHECKS, SEE LOG PAGES 005040 THRU LOGPAGES 005150. ENG CHANGE COMPLIED WITH & ALL ITEMS CLEARED. ACFT READY FOR SERVICE.