I have a new to me Grady White with factory installed Bennett trim tabs. The reservoir was full when I bought the boat but after using them once in heavy seas it is now low. I see no oily discharge in the bilge and the actuators are not oily. There is not a puddle under the pump. It's difficult to get to most of the system's tubing. The easiest parts are the pump and reservoir and then the actuators. All the lines are hidden in rigging tubes and in the hull where I can't get to them to inspect them. Where are the common leaks found if any?