As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FROM KTOL TO KBFI, THE CAPTAINS ADI AND HSI FAILED. THE CREW DIVERTED TO KRFD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE FIBER OPTIC VG/DG GYRO. THE OPERATIONAL CHECK WAS GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.