As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS EN ROUTE FROM LGA TO ORF, THE CAPTAIN NOTIFIED DISPATCH NORTH OF SBY THAT THE AIRCRAFT WAS ENCOUNTERING A MODERATE TO HEAVY PROPELLER VIBRATION AT ALL RPM SETTINGS. THE AIRCRAFT WAS DIVERTED TO SBY. IT WAS DETERMINED THAT NR 2 PROPELLER WAS CAUSING THE VIBRATION. THE PROPELLER WAS REMOVED, STATIC BALANCED AND RE-INSTALLED, GROUND RUN WAS SATISFACTORY.