As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT'S CYCLIC TRIM SWITCH FREQUENTLY BECOMES INTERMITTENT. PILOT FIRST REPORTS A STIFF CYCLIC. SOMETIMES TRIM RUNS AWAY IN ANY ONE OF FOUR DIRECTIONS. THIS CAUSES MUCH STICK FORCE. FLIGHT MUST BE TERMINATED DUE TO FATIGUE. RETURN TO HOME BASE. AVERAGE LIFE OF SWITCH IS 150 TO 250 HOURS. TEN SWITCHES HAVE BEEN CHANGED IN LAST SIX MONTHS.