I'm inclined to agree with you. It seems to be ingress from the environment rather than the internal effect of contaminated fuel.

@Gazza-75
Terrific effort & write up, alas the beat goes on.

Lets ASSUME it is a faulty radar module, I would think it's plausable that statutory warranty would apply to it, even though the car is no longer under factory warranty any longer.  Statutory warranty in simple terms states that its reasonble to expect that the item would not have failed given the period of time & cost of the item.

I don't think a radar module should have failed after 7yrs.  Its not a consumable part.

Anyway we don't know if it's failed yet - and is an inexact area but I don't think it's certain you'd be liable for the cost.

UPDATE:
So, it's easier than I thought to remove the front bumper. I have now done the following but the issue remains:

1. Inspected the radar unit and no damage or shift to its original position as far as I can tell.
2. Removed, inspected, and then re-attached the wiring harness from end to end (4 connectors all up). No damage or broken wires. I will do a continuity test on the wiring when I have more time.
* The wiring goes to 2 separate units/sensors which I'm not sure of their function. I have attached pictures.
3. Cleaned the radar which wasn't really dirty anyway but the car still display the AEB error.

I thought I'd disconnect the radar and then the car only complained about the cruise control systems, which leads me to believe the radar unit is faulty/dead. Not sure how I can test this without stripping someone else's car and swapping the unit out.

Still a bit reluctant to go to Hyundai as I've heard that radar unit is thousands.

No one's diagnosed their's yet?   I'm waiting for pay day to book in - pita not having ABS etc with all the wet weather.

Hi @Bob.W , I've done some more digging on the internet and for the most part, the issue seems very likely to be the radar going out of alignment. I am in the process of removing my bumper to check out the radar and bracket but may take a day or two as I'm doing it during coffee and lunch breaks.

Will post updates on what I find.

car is booked with Tony at Roselands Automotive Centre next Monday 25 March. Will advise outcome. Today of course my car is good as gold. 

Tony advised that all the electronics seemed to be ok and  he could not find out what the problem is without completely dismantling the doors. He had not heard of this problem before. He recommended that I go to Hyundai as they should  have more knowledge ! (I hope) He said he could install a new door lock but could not guarantee that this would fix the problem.
So, car is now booked into Suttons at Arncliffe on April 4th and i am hoping they can identify and fix it. I was advised the inspection fee is $198. Updates to follow