What was found
PRIMARY PITCH TRIM FAIL - POSSIBLY RAN AWAY BUT CAUGHT BY THE CREW. SECONDARY TRIM WORKED AS NEEDED. TOOK BOTH CREW MEMBERS TO INITIALLY LEVEL THE PLANE. LANDED WITH NO OTHER EVENT. CDMS LISTED ACTUATOR OR CONTROLLER AS FAULT. TESTED OTHER COMPONENTS OF SYSTEM, NO FAULTS FOUND. OPS CHECK OF SYSTEM AT THIS TIME NORMAL. RECOMMEND REPLACEMENT OF CONTOLLER. REMOVED AND REPLACED STAB ACTUATOR CONTROLLER WITH OVERHAULED UNIT. OPERATIONAL CHECK NORMAL. WORK DONE IAW MM 27-40-00.