I just went through this exact ordeal.
I bought a new siren from needswings. I also plan on repairing my old one batteries are on order.
I repaired my CLP pump myself and I an willing to help others with this. If you take apart the CLP (instructions can be found on this forum)and take some pictures I can tell you if I can repair it. You can PM if you want and I can help walk you through the repair of the 18 pin connector and the CLP. My SSM module had very little corrosion on it so I cleaned the corrosion off with some electrical parts cleaner and a polymer brush. I always disconnect the negative battery cable before I unplug any electronics in a vehicle.
This is a great group of people on here and they will help you to repair your car.