What was found
PILOT REPORTS, ON CLIMBOUT OF MKE THE CAPTAINS ADI SHOWS 25 TO 30 DEGREES PITCH UP, F/O'S ADI SHOWS 15 TO 20 DEGREES PITCH UP. APPEARS CAPTAINS ADI IS IN ERROR, RETURNED TO MKE. MAINTENANCE REMOVED AND REPLACED NR 1 VERTICAL GYRO. OPS CHECK GOOD, RETURNED A/C TO SERVICE.