I ran my boat into the sand. It has a low water pickup and I found it pluged with rocks and sand. I didnt notice at first but the water temp and audio alarm both indicated it was overheating and the pressure gauge only shows 5 psi at any speed. It was about 14 psi before this started. I'm now at a loss as to what to do next. I have checked the thermostats they open at 140. I have back flushed every thing. I have removed the power head, heads, and exhaust extention. I found about a tablespoon of gravel and sand under it. The tell tail appears a little weak but it is working. The boppit? valve looks fine. I'm close to taking it in but I suspect that they will charge me 1000$ or so and find nothing? HELP