I had the same issue with one of my Bravo 1's this year. Jumping on the drive didn't cure my issue either. I had to take the anodes of the rams then sand the corrosion from the anode off with 2000 grit wet sandpaper. I then used an 8 foot piece of 2x10 wedged between the fins on the drive. Have someone push the trim down button while you gradually apply more weight to the back of the 2x10 until the drive moves. Crude I know but the long lever allows you to apply pressure in a controlled fashion until it moves. It will move!