What was found
(AIR TURNBACK) DURING FLIGHT STANDBY HORIZON ATTITUDE INDICATOR FAILED (WARNING FLAG AND TUMBLED). REMOVED AND REPLACED STANDBY ATTITUDE HORIZON INDICATOR PER MM.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
(AIR TURNBACK) DURING FLIGHT STANDBY HORIZON ATTITUDE INDICATOR FAILED (WARNING FLAG AND TUMBLED). REMOVED AND REPLACED STANDBY ATTITUDE HORIZON INDICATOR PER MM.