As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKEOFF THE CREW REPORTED HIGH VIBRATIONON #1 ENGINE. THE AIRCRAFT RETURNED TO BASE. POST FLIGHT INSPECTION RUNUP FOUND VIBRATION AT 1.3 ACCOMPANIED BY AN ENGINE WHINE. THE ENGINE WAS REPLACED. INVESTIGATION FOUND A BULGE IN THE SPACER BETWEEN THE 5TH AND 6TH COMPRESSOR TURBINE DISC.