[aSpartan111]

Hello All,

I'm a bit late to give you some news, but as we say, better late than never

As @weblacky suggested I first tried changing the output capacitors (for the 3.3V and Pci 5V).
During my readings i went through some posts stating that the Cout could be the source of a regulation issue.
I had ordered some Panasonic 6.3V 220µF caps with others components (DS1780, diodes, mosfets, etc) for this repair.
Unfortunately, it didn't work.

After that, i changed the LTC1629 responsible for the 3.3V.
(Reminder, I previously exchanged the IC for the PCI 5V with the one for the 3.3V next to it, moving with it the issue).
And luckily it solved the issue, now the 3.3V runs at a stable 3.320V.

This brick is now repaired, and i tested it over a week and a half.
The issue is definitely gone, (until next time, finger crossed).

I hope this thread will help someone else in the future,

Thank you all for your help and suggestions,
I wish you some good holidays,