Just bought a used boat a couple of weeks ago. The CMC tilt and trim unit was warking fine in the old owners driveway when I checked the boat out. Now, a few weeks later, I can barely get it to lift the motor. Yes, battery is fully charged. Also, the electric motor in the unit has a dead spot, have to tap on it with a hammer to get it to move sometimes. Are they rebuildable? It looks like one bolt and one roll pin are the only things holding the pump/piston/motor assy in place. Has anyone removed one for repair? Do I have to pull the outboard to do any repairs to the CMC unit?