As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN REPORTED VIBRATION IN RT ENGINE DURING CRUISE. ACFT SENT TO HANGAR AND WAS CHECKED BY CONDITION AND TESTS PERFORMED IAW MM 72-00-00. ALL CORRECT. RT ENGINE WAS ACCELERATED UNTIL TAKEOFF POWER AND MAXIMUM VIBRATION REGISTERED 0.5, MAXIMUM VIBRATION ALLOWED 3.0. DURING OVERNIGHT SERVICE, OPS TESTS PERFORMED IAW MM 72-00-00, ALL CORRECT AND WITHOUT VIBRATION.