2013 F200. Started last Sat. Trim wouldn't go down and had to trailer boat and when I got home I released it manually after which trim and tilt worked in both directions but I went inside for awhile and when I came back out the motor had slowly drifted down all the way. Trimmed right back up but kept drifting down. Checked fluid and it seemed ok. Ordered orings for the manual release valve per advice from my buddy who had experienced this. Replaced the orings yesterday and now it lifts fine and stays but will not go down without maunually releasing pressure. Tried bleeding and got air out but not that much. Any help appreciated! Btw, the motor runs when attempting to lower motor.