I have a 1995 28 foot Bayliner that has trim tabs with a Bennett v351 HPU. I have owned the boat since 2005 and haven’t done anything to the trim tab system. I haven’t even checked the fluid level! It had worked flawlessly until last week when it completely stopped working. I just removed the Hpu, and as I removed the cover, I was amazed the unit had been working because it was TOTALLY rusted and corroded. I then ordered the right HPU and quickly and easily replaced the unit. Once again, it works perfectly. This is a real tribute to the Bennett product.