While checking out my boat today before heading out this weekend, I noticed that my outdrive will only move down and will not raise by the regular trim switch. The only way to get it to come back up is by the "trailer" button on the shifter, which works fine. It is like the regular switch is completely dead when depressed to raise. Can these things short out only in one direction? It's a 3.0 Mercruiser with the Alpha 1 outdrive and the fluid is showing full. Any advice is appreciated. Thanks