This boat and engine have less than 200 hours since new. Since new, the trim actuator has allowed the engine to leak down. During cruise, the trim must be adjusted up almost every minute to maintain position. There is no external leakage. Hydraulic fluid level has always been normal. I am finally looking at a parts diagram and want to overhaul or replace as necessary those parts that most likely are the culprit for this constant leak down since it was new. I can take some guesses on which parts I should try but I'm hoping someone here can share some knowledge and advice first. Thank you.