As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
T/R DRIVESHAFT HAS EXCESSIVE VIBRATIONS. SENT TO ACRO FOR REPAIR TWO COLLARS/BUSHINGS FOUND OUT OF CONCENTRICITY BY .0065 INCH MAX ALLOWABLE - 002 INCH. SHAFT STRAIGHTENED TO WITHIN TOLERANCE WAS .95 INCH IS NOW .006 INCH TWO COLLARS REPLACED.