Whooping sound. Is this repairable?

When powered on, the unit emits high pitched whooping sounds (see video). I opened it up, hoping to see something obvious, but everything seems fine for a 25yo device. It does this both on battery and on Wall plug. Suggestions?

I don't have access to an oscilloscope, just a soldering iron, multimeter and limited understanding.

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Try the multimeter on the speaker cones or output, and see if the voltage output fluctuates.

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Thanks for the reply. I tried it and saw that it indeed fluctuates. My meter is digital, so exactly how much is hard to say, but I saw over 6V values. What does this mean?

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