What was found
IN CRUISE FLIGHT, PILOT NOTICED YELLOW GOV LIGHT ILLUMINATED. LANDED, SHUTDOWN ACFT. MECHANIC REVIEWED VEMD FAILURE PAGE ON MX MENU OF VEMD. VEMD INDICATED FAILURE, TEST REF 120, LRU "NF TRIM POT" IN RED. REMOVED YAW ANTICIPATOR POTENTIOMETER AND REPLACED WITH NEW . GROUND RUN AND 26 MIN IN VARIOUS FLIGHT CONFIGURATIONS CHECK FLIGHT REVEALED NORMAL OPS. ACFT WAS RETURNED TO SERVICE.