As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAN VIBRATION INDICATED HIGHER THAN 3.5 THROUGHTOUT CLIMB , PEAK INDICATION 4.2 AT FL 270. PERFORMED FIM 71-05 FT 852, NO DEFECTS NOTED, ENGINE RAN OK. TROUBLESHOOTING THE ENGINE VIBRATION FOUND COOLING DUCT CLAMP LOOSE AT 10 O CLOCK POSITION. TIGHTENED THE CLAMP AND RAN THE ENGINE. OPS NORMAL IAW AMM 71-00-00.