1978merc 165 hp L6 165 outdrive , here is the problem , my outdrive will go up with a push of a button no problem,but going down it will move a very little with the switch but if you put pressure on it by hand it will go down with switch engaged.i got to looking around at the trim motor and noticed my starter was getting oily. hydrolic leak maybe and if so how to fix it and also how to add the fluid back into the resovoir. thanks