high pitched steady tone

I realize that it's a bit early for posting issues, but this happens every time that I'm parked in my garage and shut off my new 2024 Hyundai Kona Electric Ultimate. After about a minute, this high pitched sound emits from where I think is under the trunk. Today I popped open the trunk, but I...

(LEAF 2015 S, 38,700 miles, 12 battery bars, second owner, x 1 month.) I turned on the car and the EV System Warning Light is lit. No other warnings, 100% battery, estimated 90 miles available, outside temp 85-90F. I drove to town (12 miles, 45-55 mph). Parked, set the P brake, and turned off...