What was found
DEPARTED, ON CLIMB OUT CREW ENGAGED AUTO PILOT, A/P MIS-TRIM WARNING, DISENGAGED A/P TRIED TO TRIM THE RUDDER MANUALLY BUT WERE UNSUCCESSFUL. FLIGHT CREW RETURNED TO DEPARTURE, NO PASSENGERS, 2 CREW, NO EMERGENCY WAS DECLARED AND LANDING WAS UNEVENTFUL. MFG WAS CONTACTED FOR INSP AND REPAIR. INSPECTED AND FOUND RUDDER TRIM INDICATOR DEFECTIVE, REPLACED RUDDER TRIM INDICATOR WITH NEW UNIT IAW AMM 27-20-00. OPS CHECK AND TEST FLIGHT WILL BE PERFORMED 3-25 BEFORE RELEASE TO SERVICE. (K)