My trim motor will trim up and down the motor. However, when I trim it up, it will eventually loose the pressure and settle back down.

I have played with the manual trim screw and if I loosen it, it will lower the manual and then tighten it will stop.

I would like to replace the trim screw but there is a washer on the inside of the housing so that I cannot remove the screw.

BTW there has never been any fluid that has leaked from the trim motors onto the driveway or in the water.

Two questions.
1. How do I remove the retaining washer and it seems to be a full circle washer.
2. If the screw isnt the problem, then what else might the problem be?