As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, BOTH CAPTAIN'S AND FIRST OFFICER'S ADI SHOWED A 10 DEGREE LT TURN. AN EMERGENCY WAS DECLARED AND THE ACFT LANDED WITHOUT INCIDENT. POST FLIGHT INSPECTION WAS PERFORMED. R & R THE NR 1 AND NR 2 GYRO, PERFORM OPERATION CHECKS WITH NO DEFECTS. ACFT WAS RETURNED TO SERVICE.