What was found
CREW REPORT ON FINAL, FIRST OFFICER REQUESTED CAPTAIN TO RETURN RUDDER TRIM TO ZERO. CAPTAIN REPORTED WITH TRIM AT 1.5 UNITS TO RIGHT, THE RUDDER TRIM WOULD NOT RESET. CAPTAIN SELECTED TO LEFT, NO MOVEMENT, RESELECTED TO RIGHT, NO MOVEMENT. AIRCRAFT LANDED WITHOUT INCIDENT. CLEANED AND RESEATED THE C/PS ON THE AILERON AND RUDDER TRIM PANEL. OPERATIONS CHECK OK, NO FURTHER PROBLEMS.