Nintendo power supply humming (DK JR)

hindered

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I have a DK JR cocktail with a power supply that has recently developed a pretty loud hum. It's definitely coming from the supply and not the speaker, and it's present whether or not there's a board hooked up to the harness.

What could be causing this? Monitor/sound board have been capped. Powersupply is, as far as I know, original and untouched.
 
If it is the power supply, then it could be the caps. They haven't been replaced in about 25-30 years so it is a bit overdue.
 
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