Welcome to the forum Kevin, you'll find the members on here are a friendly and helpful bunch 🙂
usually the water ingress is from the battery tray which is caused by blocked drain holes in the bottom of the tray.
however if it's already been flooded then I think you'll probably need a new ecu and other electronic modules unfortunately. My advice would be to get a diagnostic check carried out to see what fault codes flag up.
cheers
Steve