I have a Motorguide Xi3 GPS kayak model trolling motor that spent the night underwater last week. It was connected to power when the boat turned over. Lots of corrosion, even the prop nut has corroded. I need advice on what to do. I can replace the motor (55#) and shaft for about $250. The control board is probably also shot and it will be about $210. The transmission was replaced a couple of months ago and hopefully is water tight. The only other pricey part would be the GPS module ($450). A new trolling motor will cost $1200. One minus the GPS module is around $900. I am thinking replace the motor, shaft, and control board and hope the GPS module is OK. The motor is still under warranty but not covered by insurance. What should I do?