As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW LOST HEADING INFORMATION IN CRUISE AT 5000 FT. DECLARED EMERGENCY AND RECEIVED NON GYRO VECTORS TO ISL 15 HYA. ATTEMPTED TO RESET GYRO C/B- WOULD NOT RESET. LANDED WITHOUT INCIDENT. MECHANIC CHANGED REMOTE GYRO (UG102). AIRCRAFT RETURNED TO SERVICE.