The hydraulic tilt and trim works fine. however when the motor is up it will not stay up unless keeper pin is engaged. The motor slowly moves down even when running - it must be trimmed up slightly once it plains out to run properly so I have to constantly trim the motor up while running. Local mechanic told me there is nothing I can do except replace the complete unit which is around $1,500 plus labor. Seems to me that the seals are just leaking and could be replaced. Is this possible? Thanks.