I have a 2000, 175 EFI s/n 0t103068, It is not in the water yet this year, i noticed that the trim is not holding position. I trimmed it up a few inches and overnight it was all the way back down. Don't know if it does it under power, boat still on trailer from winter storage. Any ideas before I dig into it? Don't want to rip out any more than I have to, i didn't see any traces of a oil leak. seems like something internal. haven't checked anything yet.