The 36 is a great model, I think it is one of the best of the series. It is small enough to handle well with one guy aboard, but it is a LOT of boat in just 36 feet.
That trim tab system of yours is bonded to zincs control electrolysis, those wires are for nothing else. The system looks "yard-rigged" to me. The initial hold down assembly is broken, looks like it was repaired, perhaps broken again. That timber and old heavy steel looks like it has a new piece of steel from a hardware store holding the trim tab in a fixed position as Tom noted.
I'm not a big fan of trim tabs in general. The recent thread about tabs indicated the 38 doesn't need them. Not sure about the 36, because it is an entirely different hull with different center of gravity, weight, displacement, etc. It may well need the tabs, but again, a 36 is a LOT of boat for trim tabs to be tossing around. I wonder how much good the tabs really do on the larger boats. I have always thought, for them to actually do anything on a larger boat, they would have to be pushing down on the water so much that they would create a lot of friction and drag. Yes, the bow might come down, but what does the drag do for you? JMHO
I do not like the through hull tab system like this because they can (and do) leak. Looking at the assembly, I can see several places where this assembly could potentially leak. The good news is this kind of system has the tabs contained under the boat where they are out of danger from docking damage.
In order to activate the tabs again, you'll have to get a complete set of hydraulic pistons, pump, etc., because it appears they're all gone. Cha Ching $$$$. I would run the boat and see if there is an apparant NEED for the tabs. I would keep an eye on that piece of new steel too, because if the upward force is severe, it will probably bend or tear at that first bolt.
Roy