As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. DURING CLIMB AND INTO CRUISE THE HEADING ANNUNCIATOR ILLUMINATED MULTIPLE TIMES ACCOMPANIED BY PROCESSION OF NR 1 HSI BETWEEN 10 AND 15 DEGREES. REMOVED AND REPLACE NR 1 DIRECTIONAL GYROSCOPE IAW AMM 34-21-04. SYSTEM CHECKS NORMAL.