MCR power 90412 High Frequency Noise (audible)

jacklick

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Donor 9 years: 2013, 2016-2021, 2023-2024
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Power supply works fine as far as voltage goes, but there is a hideous high pitch squeal coming from the power supply. I have recapped the power supply, reflowed new solder on connectors, etc. Checked capacitance on caps, checked ESR.

note: When I put in a known 100% Power supply the squeal goes away so it has to be something on the 90412 itself.

Ideas? This one doesn't appear to be obvious or easy fix to me.
 
start looking at the rest of the caps, the non-electrolytic ones. Probably on the 12v side.
 
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