As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CLIMBING THROUGH APPROXIMATELY 25000' AT AROUND 315 KNOTS WE EXPERIENCED PRONOUNCED AIRFRAME VIBRATION. RH SIDE ELEVATOR FLUTTERWAS OBSERVED ON THE F/CTL PAGE. AFTER REDUCING THE SPEED, THE VIBRATION CEASED WHEN THE AIRCRAFT PITCHED UP AND IT DID NOT OCCUR AGAIN. MAINTENANCE REPLACED ALL HORIZONTAL STABILIZER ELEVATOR HINGE FITTINGS AND ASSOCIATED HARDWARE ON BOTH ELEVATORS. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO ISSUES NOTED.