It's been on pretty much 24/7 for years.
Turn it off, open it up (the enclosure, not the PSU), and have a look. If there's dust on everything, it needs cleaning.
Vacuuming isn't great at dislodging dust from fans etc. once it's caked on. It does OK for cleaning mesh filters, but that's it.
@useless started
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It's been on pretty much 24/7 for years.