I just purchased a new to me boat. It has a 4.3 Volvo with a sx-a stern drive. I was prepping the boat for season and I noticed the trim doesn't seem to be working correctly. When I push trim up or down I can hear the motor run but the drive does not move up or down. It is currently on trailer and as far up as it goes. Am I missing something or is this my first real problem? Any advice is munh appreciated.