Helix
I had to add fluid to my wakeplate system after the deler fixed the leak in it. All the fluid leaked out then they fixed and it was low again because of bleeding the system. Mine had the same symptoms as yours, it may be leaking and your dealer can fix but if you add fluid it will work until you get it to their shop. The fluid was leaking into the bilge near hydraulic arms in back of bilge.
The Wakeplate System/ Reservoir is located right inside the engine compartment high in plain sight near the center to port side of the boat, a box looking thing with small hoses running to it. The fluid is in the bottom of the "box", check it to see if to fill line. If fluid is needed, it takes Automatic Transmission Fluid. To fill, take off top cover and there is a little black stub with a cap where you can add more fluid if needed. I got the cover off and had to call to find the place to fill it with fluid, the key was the black stud at back right of unit with a cap on it that is hard to see, at least for me. Check the fluid, fill it then check your bilge to see if leaking, if so call dealer. It shoud work for you after filling with fluid before it all leaks out again.
Good luck!
Black & Tan 2006 Mobius LSV