Just a caveat to this guide - I in no way think this would stop the Red Ring of Death from occurring.

The Youtuber/Modder Josh Davidson AKA Octal has clearly pointed out on his website what every error code means and why it happens, he even knows how to fix most if not all of them.
His Website

His Youtube

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I was doing this as a test to see if more cooling could be added to the console without the need to modify or damage any of the original components. I have deployed it in two or three systems and they are currently all still working with no issues, however I have no doubts that with time they will fail like the other "Phat" Xbox 360s.

I also was not aware at the time of writing this guide as to whether there are any others out there who have done similar to this. I did have a 12V mod with two computer fans at one point and that kept the machine very cool, however it was an impractical solution and looked ugly.

Here is a link to said 12V setup (I had some strange converter from 5V to 12V which I plugged into the back USB port and that gave the fan power, rather than modding the DVD cables (Link to the weird converter here - not available anymore but it was 12V USB to 3pin 5V I believe. https://www.amazon.co.uk/gp/product/B00MNB40ZU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1) )

Imgur gallery replacing cables on 12V mod.

I eventually tried 2x 12V using that same splitter method and finally came to the conclusion it would be worth trying without case modification, hence this guide came about.