I've got a 2010 200hp Evinrude E-Tec. The lower unit was making a knocking racket when in gear (forward). Took it to shop and discovered some of the lower unit's gear teeth are broken and the spline on the prop shaft is twisted. Had to have to hit something but sure don't remember it. I would've known if I hit something that hard, right? The prop isn't damaged nor is the lower unit housing. It's a mystery. Shop owner tells me a new lower unit is 6 grand. A rebuilt or remanufactured is around $1200. I really don't want to go through my insurance if I don't have to. I'm afraid they will hit me with a rate increase or drop me. We had to replace a lower unit 2 years ago from hitting something under the surface. What advice do you have for me? Thanks!!