I have a late 80's Suzuki 175 that I am having a little problem with. The motor worked perfectly last year, but when I pulled it out to use this year I noticed the power trim and tilt would leak down slowly when I raised it up and stop mid height. It also lowers after I trim it up while driving. I checked the oil and it seemed fine and I see no visible leaks and made sure the manual screw was tight. I have tried everything to my knowledge and I am at my wits end end .... please help