It sounds like there is a leak where the pipe nipple threads into the upper hinge of the actuator (ram).
You can try tightening the pipe nipple (remove the tubing first), but this often does not work, strips the threads or blocks the fluid path.
The best way to fix it is to replace the top part of the actuator and the pipe nipple. We can send you those parts at no charge, just send me your name and address in a private message.
To make sure we send the correct parts please confirm that there is about 1" of exposed piston shaft when the Trim Tabs are fully retracted (see the drawing below).