On my power trim/tilt unit it will not raise all the way up without manual assistance. It sounds like it has got air in the system so a couple days ago I went out and got the system to bleed the air out to the point is was making much less noise and was going up and down without help. Went to check it again yesterday and it's back to the way it was and wouldn't raise without assistance. I notice that the seal on the top of the cylinder looks like it is leaking a little bit. I think that is causing this issue but I am not 100% that is it. Any advice is appreciated.