As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE RIGHT N1 VIBES STARTED SLOWLY RISING TO 1.6 THEN UP TO 2.0, RAN QRH PROCEDURE, AND PULL BACK THE ENGINE TO ACCEPTABLE LEVELS TO HOLD ACCEPTABLE SPEED AT ALTITUDE N1 HAD TO BE AT 74 PERCENT. ENGINE VIBES SLOWLY DEGRADED. (FLT 5194) SHOOK BLADES ON NR 2 ENGINE. PERFORMED VISUAL INSPECTION AND RAN NR 2 ENGINE WITH FLIGHT CREW. NO DEFECTS NOTED AT THIS TIME.