What was found
ON CLIMB OUT FROM KVNY, PILOTS GOT A PRIM STAB TRIM FAIL, MACH TRIM FAIL, RUDDER LIMITER FAIL, CAS MESSAGES. AFTER ABOUT 5 SECONDS, ALL BUT PRIM STAB TRIM FAIL MESSAGES WENT AWAY AND COULD NOT BE CLEARED. PILOTS REVERTED TO SEC TRIM AND DECIDED TO RETURN TO KVNY SINCE THE AIRCRAFT IS ALTITUDE AND SPEED LIMITED WHEN USING SECONDARY TRIM. LANDED WITHOUT INCIDENT. MECHANIC WAS DISPATCHED TO T/S THE PROBLEM. WHEN HE POWERED UP THE PLANE, THE CAS MESSAGE WAS GONE AND THE TRIM SYSTEM RAN NORMALLY. RE-RACKED THE HSTECU AND PERFORMED FUNCTIONAL TEST PER THE M.M. NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.