Could also be a coil (choke/inductor) squealing. They look like this...
Can be diagnosed with a 3 foot length of rubber or vinyl tubing by putting one end to your ear and moving the other end around the suspected area of the sound. When the tube is over the offending part, the sound will be much louder. Don't put your hands close to any shock hazard.
The remedy is to put a few drops of paraffin wax or clear fingernail polish on the coil to dampen the vibrations and stop the squeal.
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