What was found
AFTER TAKEOFF, CAPT'S ADI INDICATED 15 TO 20 DEGREE BANK IN LEVEL FLIGHT AND INDICATED PITCH 20 DEGREES NOSE-UP IN FLIGHT LEVEL TURN. AIRCRAFT RETURNED TO MIAMI. REMOVED AND REPLACED CAPT'S VERTICAL GYRO, OPS CHECKED NORMAL IAW DAC MM 34-25-00.