As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VIBRATION FELT DURING CLIMB, STARTED AT 190 KTS AND CONTINUED TO INCREASE WITH AIRSPEED UP TO 250 KTS. PERFORMED INSPECTION OF ALL CONTROL SURFACES AND ACCESS PANELS. ALL AREAS WERE FOUND TO BE OK. ENGINES WERE RAN TO SEVERAL DIFFERENT POWER SETTINGS PER MM 71-00. ALL PARAMETERS NORMAL NO VIBRATION NOTED.