As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB FROM YYC, CAPTAIN'S ADI HAD NUMEROUS INTERMITTENT GYRO FLAGS AND ADI WAS ERRATIC. IN CRUISE, INTERMITTENT ROLL FLAGS. REMOVED AND REPLACED NR 1 VERTICAL GYRO IAW DC-9 AMM 37-27-01-4. SYSTEM OPS CHECKED GOOD. (CACTUS CALL OUT OF YYC ENROUTE TO FAR) THERE WERE NO PARTS IN FAR, SO DECISION WAS MADE TO ROUTE MXA OVER FAR DIRECT TO FSD.