As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HIGH ENGINE VIBRATION INDICATION, BOTH ENGINES. LEVELS DO NOT CHANGE W-THROTTLE. REPLACED AVM REF MM 77-31- 04 DUE TO NO TEST, RAN BOTH ENGINES AT VARIOUS POWER SETTINGS: NO ABNORMAL INDICATIONS. NO DEFECTS NOTED. CAN NOT CONFIRM CUSTOMER COMPLAINT. NO FAULT FOUND. UNIT PASSED TEST PROCEDURES IAW COMPONENT MAINTENANCE MANUAL (CMM) 77-30-25,REV 3.