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When you have the engine up on the trim lock and remove the fill cap, do you get any fluid out of the system?
Ok, with the fill cap tight, open the release screw slightly and allow the engine to slowly fall to the full down position. Then close the release screw. Trim the engine up as high as it will go. When it stops, bring it back down. Allow it to sit for a minute to not overheat the trim motor. Then bring it back up. When it stops, finish raising it by hand to the trim lock. Allow it to sit for a minute to get the air out of the fluid. open the cap and make sure that you are geting some fluid from it. If not add fluid. Then take it off the trim lock, use the trim motor to get it all the way down. Do this a few times and you should get all the air out of it.
Did you hit anything underwater recently?
It does sound like the seal on the trim ram has failed. You can reseal it and see if that would work.