As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 7690 ATB TO RBG: AFTER DEPARTURE FROM RBG THE ATTITUDE INDICATOR TUMBLED CONTINUOUSLY SHOWING 20 DEGREES NOSE UP WINGS LEVEL ATTITUDE. PILOT RETURNED TO AIRPORT AND LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE ATTITUDE INDICATOR. ENGINE RUNS CHECKED GOOD. DEFERRED AUTOPILOT ALIGNMENT. AIRCRAFT RETURNED TO SERVICE.