Flooded!

The Octavia superb estate (1.6TDI) was flooded.   Water entered at the bottom of the doors and filled the footwells.    It also entered the timing belt cover but I took that off and cleaned out all the mud and the engine worked perfectly.   However, a few days later it went into limp mode.   We have codes;

P068400 Glow time contrlo unit 1

P229400 Fuel pressure regulator 2 control circuit x2

P261A00 coolant pump B control circuit open

P068700 ecm/pcm power relay control circuit high.

Non of the electronics in the engine bay was immersed so we are wondering if there is something simple low down in the cabin that has got wet.   It seems odd that this should have happened some days after the flood.   Anyone any ideas please?