As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB OUT FROM SLC EN ROUTE TO PHX THE CAPTAINS ATTITUDE DIRECTOR INDICATOR (ADI) "ATT" RED FLAG APPEARED, AND "PITCH" AND "ROLL" COMPARATOR LIGHTS ILLUMINATED. SWITCHED TO CAPTAINS ON AUX WITH NO HELP; TURNED BACK TO SLC. MAINTENANCE REMOVED AND REPLACED THE CAPTAINS ADI IAW BMM 34-26-11, OPERATIONAL CHECK WAS GOOD.