OK....guess what I am using to make this posting.
You guessed correctly. I am typing this from the irreparable Asus Rampage IV Extreme. Unfortunately it took a bit longer, because we are busy with other things than baby sitting Asus components.
Asus support is the worst crap I have ever seen in my life. At least Asus Iberica and Asus Czech Republic. I wish they would have listened and let me send it to Asus Netherlands for a second opinion.
We sent the board to this guy from Ebay (Jose you are the man!) who offers repairs for X79 and X99 at a flat rate of 30€ for diagnosis and 60 additional Euros if it can be repaired. It was picked up on Monday, got a diagnosis on Tuesday that it was repairable (with photos of it running and posting) and on Wednesday we got it back. I installed it and it works again.
A coil and a capacitor were exchanged. He also found some soldering flux on it, which makes me wonder where that came from?? They probably tried to fix it by trial and error and failed and then declared it as irreparable. There also was some sulfate on it, probably from a leaking CR232 battery?? After less than 3 years. The red marker pointing onto the chip with the two blue pins had nothing to do at all with the problem. It still has its two blue pins. LOL. Besides of that, the board was also cleaned, what a great service! I don't want to run ads here, but you can find the offer on ebay. If not send me a PM and I'll give you the contact details.
However, this whole experience beginning with how they handled the missing invoice (Asus & Amazon) to the horrible support has totally killed my trust in this brand. It took ~20 years to build it and they quickly destroyed it by slapping CID stickers on boards where they don't belong and some senseless email and telephone conversations. This whole case should have been handled by warranty. They should have found what the problem is and even if not handled by warranty they should have offered a repair and letting us know what it would cost. Instead they think they save the company some money and that the customer will buy a new Asus anyways. I don't think Asus saves any money by sending their products to this probably outsourced wanna-be repair service. It is quite the opposite.
The only guy that made sense in this context was Eleiyas, but unfortunately he could not save Asus from that blame. Maybe they should give him more power to overrule those bad decisions.
Anyways thanks for any help offered. Case closed.
Some pics of how it should be done: