OK, now it makes more sense, thanks for clarifying. With the lines disconnected at the hydraulic rams, fluid should squirt out pretty good from the lines when hitting the up or down button. Shield/catch the fluid.
If that's good, the rams might just be stuck (they could be damaged, especially if they took a hit). Connect the lines back up again and try hitting the drive end of the ram with a rubber mallet while operating the trim pump. You connect them back to the drive and forcefully "jiggle" the drive, too. You can be pretty rough with it.
If that's good, the rams might just be stuck (they could be damaged, especially if they took a hit). Connect the lines back up again and try hitting the drive end of the ram with a rubber mallet while operating the trim pump. You connect them back to the drive and forcefully "jiggle" the drive, too. You can be pretty rough with it.