Buing smell on power supply

I opened my desktop and leave it until it boot. After few minutes, I logged-in my account and noticed that there is a buing smell on my computer. I immediately tued off my AVR thinking something might explode or fireup. It was already midnight so I left it unplugged.

The following day, I removed all the components to check where the buing smell came from. I started from the AVR, and it seems normal.

Then I tried powering up PSU alone (connecting green wire to black to tu it on) and noticed that the buing smell came from that component. I checked if there are signs of bu marks but I found nothing, it seems normal, no smoke coming out of the PSU.

Is there a way I could fix it or just a normal compressed air to clean it might repair my PSU? There are dust build up on the dust filter(pc case) and there is a minimal amount of dust inside my PSU.

My power supply is Cougar SL 600 which I bought 3-4 years ago, out of warranty.

I usually leave my computer running oveight (9pm - 5am)

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