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I would replace the fan. You should be able to find a better fan.
Looks like there are 4 fans and one in the power supply?
If you haven't already, thoroughly clean out any dust that's in there. Also check the stock fans for dust build up. I'd recommend doing your best to tidy up the wiring as well to allow the most amount of airflow possible.
I used a couple of quiet 50mm PC fans in mine. They will be slightly smaller and won't completely fit, but they will work fine. I was able to secure them with 2 or 3 screws which was plenty to firmly mount the fans in place without movement. The stock fans merit/ami supplied are terrible with regards to db noise. Just replacing the stock fans with quiet rated PC fans makes a huge difference.
In addition to that, I added one of these slim fans, pointed directly at the cpu to "bulletproof" it a bit. I had to do some improvised modding and secured it with a screw or two, some double-sided foam tape and a large zip tie across the front for insurance.
https://www.amazon.com/Scythe-Slip-Stream-120mm-SY1212SL12L/dp/B002CYPWTG
Jim -
Do you think a 50x50x10mm fan will fit in the places that currently have a 52x52x5mm fan (really concerned with the width more than anything...).... Just curious if you remember having to have slightly wider (10mm or 15mm fans v 5mm fans) dimensions.
Thanks, Todd