As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED A HEAVY VIBRATION ON RT ENGINE AT 86 PERCENT CLIMB POWER. LT ENGINE VIBRATION TO RT ENGINE OUT OF FEATHER VIBRATES BADLY. THE ACFT WAS REMOVED FROM SERVICE. COMPLIED WITH LT AND RT ON GROUND PROPELLER DYNAMIC BALANCING IAW MM 61-00-00. THE OPS CHECK WAS GOOD. THE ACFT WAS RETURNED TO SERVICE.