As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT VIBRATION, PASSING FL230. REDUCED POWER SETTING CONTINUED CLIMB AND INCREASED POWER TO NORMAL CLIMB THRUST PASSING FL 250 VIBRATIONS CEASED AFTER THAT. REF NON-ROUTINE CONTINUATION CARDS FOR REMOVED AND REPLACED OF PCU AND FLAIR DAMPENER BUSHINGS AND BOLTS.