I have a 2009 R25 with cummins diesel. Long story short, I needed to replace the turbo, which is now done. However, when going out for a sea trial today, we were getting underway but was getting no thrust from the prop. My diver could not get the marine growth off the prop due to shallow water. Question: can a couple of mm of hard marine growth (one year in the water in Venice FL) make it such that you get zero thrust?