As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT N2 VIBRATIONS ON DESCENT. CREW NOTICED 2 SIMULTANEOUS BUMPS- ALL ENGINE PARAMETERS OK. ON DESCENT, AT POWER REDUCTION, VIB ICON APPEARS ON RT N2 GAUGE. THE POWER REDUCED TO IDLE UNTIL LANDING AT DESTINATION AIRPORT. THE BORESCOPE INSP REVEALED THAT A BLADE ON COMPRESSOR STAGE 2 HAD DEPARTED AND DAMAGED OTHER STAGE BLADES. THE COMPRESSOR WAS REPLACED.