Fan on Sifive Unleashed dying

After running continuously pretty much since I got it, I’m afraid the fan on my board is dying. It has always been noisy, but it’s becoming unbearable. I also really don’t want the CPU to burn out.

Does anyone have suggestions what to replace it with? Is it hard to do?
I have read the discussion here: Make/model of the fan on the unleashed board but maybe there’s new developments since.

This has been discussed before. You can find the answer here.