What was found
IMMEDIATELY AFTER TAKEOFF DURING INITIAL CLIMB, FLIGHT CREW NOTED CAPTAIN ATTITUDE DIRECTIONAL INDICATOR (ADI) FAILED (ATTITUDE FLAG IN VIEW). FLIGHT CREW ELECTED TO RETURN TO THE POINT OF DEPARTURE. FUEL WAS DUMPED TO BRING ACFT BELOW MAXIMUM LANDING. AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE PERSONNEL CONFIRMED ADI FAILED. REPLACED ADI. GROUND OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE. (X)