[MPDev]

I've posted this before but have been trying to piece more together. At the moment I have the following electrical issues:

PDC - the whole system is not working - had an independent garage check the codes and they said all of the parking sensors were showing as faulty so they assume it was the control module (junction box electrical)

Windscreen washer fluid sensor - sensor not working

Intermittent (I assume) ABS/ Speed Sensor not working giving me the stability control / cruise control etc etc. errors. This only happens after driving for over a few hours or so (motorway runs). So I assume one of the sensors is faulty but it's intermittent so nothing came up when the indy checked i

I have also been experiencing water in the boot - assume leaking from the third break light.

I had a new battery put in back in November as it was coming to the end of its life anyway.

My query is, as there are a number of different electrical issues going on, are they all coincidental OR, could this be as a result of water damage? What's the best way of me checking this?

Thanks in advance.