core rc uac 50 charger noise

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Hi, I have a core rc uac 50 charger, I have had it for nearly a year now. Recently when I
started charging the fan would make a noisy whirring noise, continue for 30 secs or so and then sound fine again. The charger doesn't seem to get that warm, but it's not cold either. Is this just a case of a knackered fan, and if so is it fairly easy to replace myself?