This is my first boat. The boat runs great but wasn't used for about 3 years. When I lift the motor up and down with the trim switch it works fine. However, the motor slowly begins to fall back down, not completly down. Someone said add trim fluid or bleed it. Where do I put the trim fluid in? Also, I bought OMC Power Trim/Tilt & Steering Fluid, is this the right stuff? The guy at the boat place wasn't helpful. Thanks a lot.