What was found
DTW - FLT 114 - FIVE MINUTES AFTER TAKEOFF ATTEMPTED TO ENGAGE AUTO PILOT NR 2 WOULD NOT ENGAGE. TRIED NR 1 IT WOULD NOT ENGAGE. COMPASSES AND ATTITUDE INDICATOR WERE CLOSELY MATCHED. AFTER SEVERAL ATTEMPTS TO ENGAGE AUTO PILOT NR 1 AND NR 2 AUTO PILOT NR 1 ENGAGED AND OPS NORMAL. AUTOPILOT NR 1 USED DTW TO PBI. FOUND CAPTAINS AUTO PILOT DISCOUNTED SWITCH BAND AND FLIGHT GUIDANCE CONTROL PANEL BAD. REMOVED AND REPLACED CAPTAINS AUTO PILOT DISCOUNT SWITCH AND FLIGHT GUIDANCE CONTROL PANEL. SYSTEM OPS CHECK GOOD IAW MD80 MM 22-01-05 AND 22-01-04. (M)