As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN'S EHSI WILL NOT INITIALIZE THEN CORRECTED ITS SELF ON THE GROUND, BUT TWICE DISCONNECTED AUTOPILOT IN FLIGHT. WHEN NR 1 GYRO COMPUTER FLAG APPEARED NR 1 HSI LOST HEADING. RETURNED TO SLC. RERACKED NR 1 AHC85 AND REINITIALIZED REORIENTED. PERFORMED AHRS TEST CHECK OK.