Morning

So lots of faults but essentially I have water in my TCU - changed - part was faulty - old one still works!
But damage to connectors
Behind the under bonnet fuse box is a water trap
I can see several cables which go behind the plastic wheel arch - water is clearly ru bing down these to the connectors behind the arch
How do you seal this area!?
It’s a nightmare
I’ve 27 fault codes
I’m assuming this area is my last part causing my issues
Anyone pulled the arch off and cleaned the connect behind?
Or am I wasting my time?
2.7 diesel 2006 auto
Thanks