I am new to this whole boat thing so be easy on me. I have a 92 Maxum with a 7.4 Bravo and a Mercruiser. The trim cylinders will not lower. The pump runs and sounds normal. I removed a line and it is pumping fluid. The boat did start to sink last year and the fluid looked kinda like milk. So I changed the fluid but it still will not go down. The boat has been sitting for about 9 months with the trim all the way up. Any helpful tips on how to get it to work. Thanks.