I managed to run aground and put some scratches in my fish finder transducer. I'm not sure if the damage is interfering with the readings, there's a lot of 'frass' on the screen, but I'm not sure if it's because of the scratches or just the temperature of the water. Still, I would like to fix the scratches if possible. Would sanding the bottom of the transducer work, or is there some other method? It's a transom mount skimmer transducer.