As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW NOTICED A VIBRATION IN FLIGHT ENROUTE. DIVERTED. TROUBLESHOOTING FOUND THE LT STARTER GENERATOR TO BE DEFECTIVE. REMOVED LT STARTER GENERATOR, AND INSTALLED OVERHAULED STARTER GENERATOR. INSTALLATION AND OPS CHECKED GOOD. RAN ENGINE WITH NO VIBRATION NOTED.